Leave a ring about (7)
I believe the answer is:
abandon
'leave' is the definition.
(abandoning is a kind of leaving)
'a ring about' is the wordplay.
'ring' becomes 'band' ('band' can be a synonym of 'ring').
'about' becomes 'on' (**).
'a'+'band'+'on'='ABANDON'
(Other definitions for abandon that I've seen before include "Desert - recklessness" , "Kick" , "Lack of constraint" , "Evacuate; desert" , "ditch" .)