Crossword Genius

Picnic intruder (3)

Ross

I believe the answer is:

ant

(Other definitions for ant that I've seen before include "Emmet or pismire" , "Social worker" , "Colonial insect?" , "Industrious insect" , "Small social insect" .)

I've seen this clue in the Penny Press, The Star Tribune and the Newsday.
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