Stopped losing head, and relaxed (5)
I believe the answer is:
'relaxed' is the definition.
(I've seen this before)
'stopped losing head' is the wordplay.
'stopped' becomes 'ceased' ('cease' can be a synonym of 'stop').
'losing head' means to remove the first letter.
'ceased' with its first letter taken away is 'EASED'.
'and' is the link.
(Other definitions for eased that I've seen before include "became less tight" , "Became less painful" , "Died down" , "Relieved, mitigated" , "Given relief" .)