Unusual sort may find angle on love with theologian (3,4)
I believe the answer is:
odd fish
'unusual sort' is the definition.
(odd fish can mean an eccentric person)
'angle on love with theologian' is the wordplay.
'angle' becomes 'fish' ('fish' can be a synonym of 'angle').
'on' is a charade indicator (letters next to each other).
'love' becomes 'o' (In tennis, 'love' means 'zero').
'with' is a charade indicator (letters next to each other).
'theologian' becomes 'dd' (Doctor of Divinity degree).
'o'+'dd'='odd'
'fish' after 'odd' is 'ODD FISH'.
'may find' acts as a link.
(Other definitions for odd fish that I've seen before include "Person of strange habits" , "Peculiar person" , "Eccentric person of piscine sort" .)