Jam and a piece of cheese? (5)
I believe the answer is:
wedge
This clue is a double definition.
'jam' is the first definition.
(thesaurus)
'a piece of cheese?' is the second definition.
'and' acts as a link.
(Other definitions for wedge that I've seen before include "Tapering piece" , "Piece of wood thick at one end, thin at other" , "Tapering object pushed into a gap - golf club" , "Tapered insert" , "piece of cake" .)