
1) Approaching stealthily 2) Following 3) Tracking down 4) Work by Joyce Carol Oates
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https://www.crosswordclues.com/clue/stalking

1) Deerstalking 2) Following 3) Harassment
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https://www.crosswordclues.com/clue/stalking

- the act of following prey stealthily
- walk stiffly
- recur constantly and spontaneously to
- go through (an area) in search of prey
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Stalking is unwanted or obsessive attention by an individual or group toward another person. Stalking behaviors are related to harassment and intimidation and may include following the victim in person or monitoring them. The word stalking is used, with some differing meanings, in psychology and psychiatry and also in some legal jurisdictions as a...
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http://en.wikipedia.org/wiki/Stalking

• (p. pr. & vb. n.) of Stalk
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http://thinkexist.com/dictionary/meaning/stalking/

(from the article `hunting`) In open country where game can be viewed from afar and, conversely, game can see the hunter, a slow, stealthy approach, stalking, is necessary, the ...
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http://www.britannica.com/eb/a-z/s/151

Repeatedly and obsessively harassing someone in ways that alarm and frighten them. Commonly, stalking begins with annoying or threatening phone calls, letters, or electronic communications and escalates to constant following or surveillance. Stalking is a crime in every state, though it may be called by another name, such as criminal harassment. It...
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http://www.nolo.com/dictionary/stalking-term.html

[
adj] - moving silently and deliberately
Found on
http://www.webdictionary.co.uk/definition.php?query=stalking

to sneak up on prey
Found on
https://sciencetrek.org/sciencetrek/topics/wolves/glossary.cfm
noun a hunt for game carried on by following it stealthily or waiting in ambush
Found on
https://www.encyclo.co.uk/local/20974

creeping up on a fish, to surprise or not disturb it.
Found on
https://www.encyclo.co.uk/local/22502
No exact match found.