Club card provided by Head of Membership (4)
I believe the answer is:
mace
'club' is the definition.
(I've seen this before)
'card provided by head of membership' is the wordplay.
'card' becomes 'ace' (ace is a kind of card).
'provided by' means one lot of letters go next to another.
'head of' suggests taking the first letters.
The first letter of 'membership' is 'm'.
'ace' put after 'm' is 'MACE'.
(Other definitions for mace that I've seen before include "Spice; ceremonial baton" , "put on the rack?" , "Spice; heavy club" , "Tear gas - spice" , "Came to get ceremonial staff" .)