A piece of cake at the club? (5)
I believe the answer is:
wedge
I believe this is a double definition.
'a piece of cake' is the first definition.
(I've seen this before)
'the club?' is the second definition.
(wedge is a kind of club)
'at' is the link.
(Other definitions for wedge that I've seen before include "Chunk" , "Splitting device" , "Significant amount of money (informal)" , "Chock" , "Lofted club" .)