Crossword Genius

The father I aim to make an ally of (6)

Ross

I believe the answer is:

friend

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'make an ally of' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'the father i aim' is the wordplay.
'the father' becomes 'fr' (abbreviation as in a priest's title).
'aim' becomes 'end' (both can mean a goal or purpose).
'fr'+'i'+'end'='FRIEND'

'to' acts as a link.

Can you help me to learn more?

(Other definitions for friend that I've seen before include "One who gives proof of genuine regard" , "One you know well and regard with affection" , "Close associate" , "Ally, supporter" , "China" .)

I've seen this clue in the Evening Standard.
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