Member left Bengali film club at last (4)
I believe the answer is:
limb
'member' is the definition.
(limb is a kind of member)
'left bengali film club at last' is the wordplay.
'left' becomes 'l' (common abbreviation).
'at last' indicates one should take the final letters.
The final letters of 'bengali film club' are 'imb'.
'l'+'imb'='LIMB'
(Other definitions for limb that I've seen before include "Branch - member" , "Tentacle" , "Part of body or branch of tree" , "Jointed appendage" , "Eg, arm, leg" .)