My bits (6)
I believe the answer is:
crumbs
'bits' is the definition.
(I know this)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for crumbs that I've seen before include "Surprised expression; bread fragments" , "Gosh!" , "Bits of bread - expression of dismay!" , "Morsels of bread" , "By heck! -all that's left of the cake?" .)