
1) Composition material 2) Mortar 3) Mortar mixture
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https://www.crosswordclues.com/clue/compo

1) Materials
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https://www.crosswordclues.com/clue/compo
[demoscene] This category includes members of the Casablanca-class of escort aircraft carriers. ...
Found on
http://en.wikipedia.org/wiki/Compo_(demoscene)

• (n.) Composition paid by a debtor. • (n.) A composition for billiard balls. • (n.) A mortar made of sand and cement. • (n.) A preparation used in currying leather. • (n.) Short for Composition; -- used, esp. in England, colloq. in various trade applications; • (n.) A carver`s mixture of resin, whiting, and glue, used...
Found on
http://thinkexist.com/dictionary/meaning/compo/
[Naval Acronyms and Slang] Composite Ration (also called comp rat)
Found on
http://www.encyclo.co.uk/local/21733
Com'po noun ; plural
- pos . Short for
Composition ; -- used, esp. in England, colloquial in various trade applications; as :
(a) A mortar made of sand and cement.
(b) A carver's mixture of resin, whiting, and glue, used instead of plaster of Paris for ornamenting walls and...
Found on
http://www.encyclo.co.uk/webster/C/123

Compensation, such as workers' compensation.
Found on
http://www.faqs.org/faqs/australian-faq/part5/

Compo is British navy slang for a monthly advance of wages.
Found on
http://www.probertencyclopaedia.com/browse/ZCA.HTM

Workers' Compensation pay
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https://mudcat.org/aussie/display_all.cfm

composition material.
Found on
https://www.infoplease.com/dictionary/compo

Workers' Compensation pay
Found on
https://www.koalanet.com.au/australian-slang.html
No exact match found.