Crossword Genius

In favour of helping balance (10)

Ross

I believe the answer is:

proportion

'balance' is the definition.
(synonyms)

'in favour of helping' is the wordplay.
'in favour of' becomes 'pro' (being pro a particular cause).
'helping' becomes 'portion' (synonyms).
'pro'+'portion'='PROPORTION'

(Other definitions for proportion that I've seen before include "Part - one needs a sense of it" , "balance" .)

I've seen this clue in The Telegraph.
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