Girl not wanting a financial backer (5)

I believe the answer is:

angel

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'a financial backer' is the definition.
(I've seen this before)

'girl not wanting' is the wordplay.
'girl' becomes 'ange'.
'not wanting' becomes 'l' (I can't justify this - if you can you should believe this answer much more).
'ange'+'l'='ANGEL'

Can you help me to learn more?

(Other definitions for angel that I've seen before include "Heavenly body" , "Guardian spirit; theatre investor" , "Cloud resident?" , "Theatre financier" , "Investor for show" .)

I've seen this clue in The Telegraph.

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