Crossword Genius

In proportion to a parrot roughly (3,4)

Ross

I believe the answer is:

pro rata

'in proportion' is the definition.
(I've seen this before)

'a parrot roughly' is the wordplay.
'roughly' indicates an anagram.
'a'+'parrot'='aparrot'
'aparrot' anagrammed gives 'PRO RATA'.

'to' acts as a link.

(Other definitions for pro rata that I've seen before include "fairly divided" , "Proportionally" , "In proportion (Latin)" , "Proportionately based" , "maintaining correspondence" .)

I've seen this clue in the Sydney Morning Herald.
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