Give a share of an atoll, possibly (5)

I believe the answer is:

allot

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'give a share' is the definition.
'allot' can be an answer for 'give' (allotting is a kind of giving). I'm not certain of the 'a share' bit.

'an atoll possibly' is the wordplay.
'possibly' indicates anagramming the letters.
'atoll' anagrammed gives 'ALLOT'.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for allot that I've seen before include "Award (share, task)" , "grant" , "deal" , "Assign a share" , "Dedicate" .)

I've seen this clue in the Evening Standard.

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