Brains can get you a chunk of bread (4)
I believe the answer is:
loaf
'brains' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for loaf that I've seen before include "Spend time idly, having slang head" , "BRINK/BRICK" , "Hang around for bread?" , "Mass of bread" , "more than just crumbs!" .)