Are within call when there’s an allocation (5-3)

I believe the answer is:

share-out

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'an allocation' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'are within call' is the wordplay.
'within' indicates putting letters inside.
'call' becomes 'shout' (synonyms).
'are' going into 'shout' is 'SHARE-OUT'.

'when there's' acts as a link.

Can you help me to learn more?

(Another definition for share-out that I've seen is " Distribute".)

I've seen this clue in the Evening Standard.

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