Sloth perhaps ends daily unwinding (6,3)
I believe the answer is:
deadly sin
'sloth perhaps' is the definition.
(sloth is a kind of deadly sin)
'ends daily unwinding' is the wordplay.
'unwinding' indicates anagramming the letters (to unwind can mean to break something apart).
'ends'+'daily'='endsdaily'
'endsdaily' with letters rearranged gives 'DEADLY SIN'.
(Other definitions for deadly sin that I've seen before include "Lethal lapse like pride, gluttony or envy" , "a cause of damnation" , "Anger, covetousness, envy, gluttony, lust, pride or sloth" , "not good - bad" , "Anger, say" .)