End beating back in dodgy club ... (8)
I believe the answer is:
dissolve
'end' is the definition.
(I know that dissolve is a more specific form of the action end)
'beating back in dodgy club' is the wordplay.
'beating' becomes 'loss' (I've seen this in another clue).
'back' shows that the letters should be reversed in order.
'in' indicates putting letters inside.
'dodgy club' becomes 'dive' (term for a disreputable night club).
'loss' back-to-front is 'ssol'.
'ssol' inserted within 'dive' is 'DISSOLVE'.
(Other definitions for dissolve that I've seen before include "Put end to marriage - in water?" , "Nullify" , "Become liquid, melt" , "Annul or end, a marriage say" , "Loves Sid (anag)" .)