Former lover, with skill, turned over (5)
I believe the answer is:
extra
'over' is the definition.
(I've seen this before)
'former lover with skill turned' is the wordplay.
'former lover' becomes 'ex'.
'with' says to put letters next to each other.
'skill' becomes 'art' (I've seen this before).
'turned' says the letters should be written backwards.
'art' in reverse letter order is 'tra'.
'ex'+'tra'='EXTRA'
(Other definitions for extra that I've seen before include "more than usually" , "Spare" , "Exceptionally" , "appearing in crowd scene" , "late edition" .)