Crossword Genius

Soldiers and monkeys (5)

Ross

I believe the answer is:

troop

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'soldiers' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for troop that I've seen before include "herd" , "Squad" , "March" , "Porto (anag.)" , "Military unit" .)

I've seen this clue in The Sun.
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