US broadcaster accepts drink? Crikey! (6)
I believe the answer is:
crumbs
'crikey' is the definition.
(both are expressions of shock)
'us broadcaster accepts drink?' is the wordplay.
'us broadcaster' becomes 'CBS' (US TV network).
'accepts' means one lot of letters goes inside another.
'drink?' becomes 'rum' (rum is a kind of drink).
'cbs' placed around 'rum' is 'CRUMBS'.
(Other definitions for crumbs that I've seen before include "Morsels of bread" , "Crikey, cripes" , "Bits of bread - expression of dismay!" , "that surprises me!" , "Blimey!" .)