
1) Canadian indie rock group 2) Wrecker
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https://www.crosswordclues.com/clue/knacker

A person who disposes of livestock animals unfit for human consumption, such as sick or injured horses.[163]
Found on
http://en.wikipedia.org/wiki/Glossary_of_equestrian_terms

A knacker is a person in the trade of rendering animals that have died on farms or are unfit for human consumption, such as horses that can no longer work. This leads to the slang expression `knackered` meaning very tired, or `ready for the knacker`s yard`, where old horses are slaughtered and the by-products are sent for rendering. A knacker...
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http://en.wikipedia.org/wiki/Knacker

• (n.) One who makes knickknacks, toys, etc. • (n.) One of two or more pieces of bone or wood held loosely between the fingers, and struck together by moving the hand; -- called also clapper. • (n.) a harness maker. • (n.) One who slaughters worn-out horses and sells their flesh for dog`s meat.
Found on
http://thinkexist.com/dictionary/meaning/knacker/
Knack'er noun 1. One who makes knickknacks, toys, etc.
Mortimer. 2. One of two or more pieces of bone or wood held loosely between the fingers, and struck together by moving the hand; -- called also
clapper .
Halliwell. Found on
http://www.encyclo.co.uk/webster/K/13

Knacker is British slang for to tire or exhaust.
Found on
http://www.probertencyclopaedia.com/browse/ZK.HTM

[
n] - someone who buys old buildings or ships and breaks them up to recover the materials in them 2. [n] - someone who buys up old horses for slaughter
Found on
http://www.webdictionary.co.uk/definition.php?query=knacker
[Animal farm] a person who buys and slaughters worn-out horses and sells their flesh as dog's meat.
Found on
https://www.cliffsnotes.com/literature/a/animal-farm/study-help/full-glossa

a harness maker
Found on
https://www.encyclo.co.uk/local/21654

a person who buys animal carcasses or slaughters useless livestock for a knackery or rendering works. · a person who buys and dismembers old houses, ships, etc., to salvage usable parts, selling the rest as scrap. · an old, sick, or useless farm animal, esp. a horse. · a harness maker; a saddler.
Found on
https://www.infoplease.com/dictionary/knacker
No exact match found.