Portion of bread (4)
I believe the answer is:
loaf
'portion of bread' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for loaf that I've seen before include "Idle - head" , "cottage?" , "To take things easy" , "` `Half a .... is better than no bread' '" , "Head (slang) -- be a slacker" .)