Gosh, is that all the bread that's left? (6)
I believe the answer is:
crumbs
'gosh' is the definition.
(I've seen this before)
I cannot 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 "Tiny bits of bread - golly!" , "By heck! -all that's left of the cake?" , "Morsels of bread" , "Surprised expression; bread fragments" , "Small bread particles" .)