Boar's mate (3)
I believe the answer is:
sow
'boar's mate' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sow that I've seen before include "Prepare farmland" , "Plant seed in soil" , "Female bear" , "One who takes care of litter" , "Scatter seed; pig" .)