Some bits left? My goodness! (6)
I believe the answer is:
crumbs
This clue is a double definition.
'some bits left?' is the first definition.
(bits left over from a meal)
'my goodness' is the second definition.
(both are expressions of surprise or shock)
(Other definitions for crumbs that I've seen before include "Surprised expression; bread fragments" , "Crikey, cripes" , "By heck! -all that's left of the cake?" , "Blimey!" , "Tiny bits of bread - golly!" .)