Stopped being cold and relaxed (6)
I believe the answer is:
ceased
'stopped' is the definition.
('cease' can be a synonym of 'stop')
'cold and relaxed' is the wordplay.
'cold' becomes 'c' (eg on taps).
'and' is a charade indicator (letters next to each other).
'relaxed' becomes 'eased' (I've seen this before).
'c'+'eased'='CEASED'
'being' acts as a link.
(Other definitions for ceased that I've seen before include "Stopped, quit" , "Terminated" , "Stopped, desisted" , "Stopped, quitted" , "Came to a close" .)