Kick out swimmer that's pinched ten pence (5)
I believe the answer is:
expel
'kick out' is the definition.
(synonyms)
'swimmer that's pinched ten pence' is the wordplay.
'swimmer' becomes 'eel' (eels swim).
'that's pinched' indicates putting letters inside.
'ten' becomes 'X' (Roman numeral).
'pence' becomes 'p'.
'x'+'p'='xp'
'eel' going around 'xp' is 'EXPEL'.
(Other definitions for expel that I've seen before include "Drive out - dispossess" , "Kick out" , "Drive out - eject" , "Possibly remove from club" , "Boot out" .)