A fresh air allocation is everyone's entitlement (4,5)

I believe the answer is:

fair share

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'everyone's entitlement' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'a fresh air allocation' is the wordplay.
'a fresh' becomes 'f' (this could be a standard abbreviation I've not previously seen).
'allocation' becomes 'share' (share is a kind of allocation).
'f'+'air'+'share'='FAIR SHARE'

'is' is the link.

Can you help me to learn more?

(Another definition for fair share that I've seen is " Legitimate allocation".)

I've seen this clue in The Globe and Mail.

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