Cake in hamper? (5)
I believe the answer is:
block
I believe this clue is a double definition.
'cake' is the first definition.
(thesaurus)
'hamper?' is the second definition.
(thesaurus)
'in' acts as a link.
(Other definitions for block that I've seen before include "Mass of wood etc - set of buildings" , "Obstruct" , "Jam" , "Solid shape; prevent" , "cake?" .)