Crossword Genius

Hill workers (4)

Ross

I believe the answer is:

ants

'hill workers' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for ants that I've seen before include "Termites" , "workers found returning" , "Hard workers" , "Inhabitants of a formicary" , "Six-foot insects" .)

I've seen this clue in the New York Times, the King Feature Syndicate, The Wall Street Journal, the L.A. Times Daily, The Globe and Mail and the LA Times.
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