Club attracts female swimmer (6)
I believe the answer is:
bather
'swimmer' is the definition.
('bather' can be a synonym of 'swimmer')
'club attracts female' is the wordplay.
'club' becomes 'bat' (I've seen this before).
'attracts' means one lot of letters go next to another.
'female' becomes 'her' (I've seen this before).
'bat'+'her'='BATHER'
(Other definitions for bather that I've seen before include "One dipping in the briny?" , "one getting into the drink" , "man getting soaked?" , "Seaside swimmer" .)