Lover married badly (7)
I believe the answer is:
admirer
'lover' is the definition.
(I know that admirer is a type of lover)
'married badly' is the wordplay.
'badly' is an anagram indicator (letters in the wrong order).
'married' anagrammed gives 'ADMIRER'.
(Other definitions for admirer that I've seen before include "Married to one who thinks highly of" , "A young lady's beau - he thinks she's great" , "sweetheart" , "One who thinks highly or romantically of" , "potential suitor" .)