Married demented lover (7)
I believe the answer is:
admirer
'lover' is the definition.
(I know that admirer is a type of lover)
'married demented' is the wordplay.
'demented' indicates an anagram.
'married' is an anagram of 'ADMIRER'.
(Other definitions for admirer that I've seen before include "Fan or devotee" , "Supporter or fan" , "One who regards (someone) with respect" , "girlfriend?" , "potential suitor" .)