Parson lost love for singer (7)
I believe the answer is:
soprano
'singer' is the definition.
(soprano is a kind of singer)
'parson lost love' is the wordplay.
'lost' indicates anagramming the letters.
'love' becomes 'o' (love means zero in tennis).
'parson' is an anagram of 'sopran'.
'sopran'+'o'='SOPRANO'
'for' acts as a link.
(Other definitions for soprano that I've seen before include "Female singer" , "Isolde, Violetta or 25" , "chorus girl, perhaps" , "Norman, perhaps" , "(Singer of) the highest vocal range" .)