Crossword Genius

He helps to even up supply and exceed normal limits (4,3,8)

Ross

I believe the answer is:

push the envelope

'exceed normal limits' is the definition.
(I've seen this in another clue)

'he helps to even up supply' is the wordplay.
'supply' indicates an anagram (in a supple way).
'he'+'helps'+'to'+'even'+'up'='hehelpstoevenup'
'hehelpstoevenup' anagrammed gives 'PUSH THE ENVELOPE'.

'and' acts as a link.

(Other definitions for push the envelope that I've seen before include "Instruct postman at tight letter box" , "what postman does on reaching letterbox" , "Challenge" , "to try something new" , "achieve more than seems possible" .)

I've seen this clue in The Independent.
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