Club cards (6)
I believe the answer is:
hearts
I believe this clue is a double definition.
'club' is the first definition.
(I've seen this before)
'cards' is the second definition.
(heart is a kind of card)
(Other definitions for hearts that I've seen before include "Body pumps" , "They beat" , "Scottish footballers" , "Card suits in bodies" , "Cores" .)