Financial backer with a new angle (5)
I believe the answer is:
angel
'financial backer' is the definition.
(I've seen this before)
'a new angle' is the wordplay.
'a new' indicates anagramming the letters.
'angle' is an anagram of 'ANGEL'.
'with' acts as a link.
(Other definitions for angel that I've seen before include "Top D [DECORATION]" , "somewhere on the Northern Line" , "Very helpful person" , "Theatrical backer" , "Seraph or cherub?" .)