Pismire (3)
I believe the answer is:
ant
'pismire' is the definition.
(synonyms)
This is all the clue.
(Other definitions for ant that I've seen before include "` `Go to the ... thou sluggard' '" , "Proverbially hard-working insect" , "Little boy" , "Small social insect" , "that may be a soldier" .)