Summarise about a hundred, we gather (5)

I believe the answer is:

recap

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'summarise' is the definition.
(recapping is a kind of summarizing)

'about a hundred we gather' is the wordplay.
'about' becomes 're' (regarding).
'a hundred' becomes 'C' (Roman numeral).
'we gather' becomes 'ap' (I can't justify this - if you can you should believe this answer much more).
're'+'c'+'ap'='RECAP'

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(Other definitions for recap that I've seen before include "Caper (anag)" , "Summarise at the end" , "play again" , "Retrospective summary" , "Go over study material again" .)

I've seen this clue in the Evening Standard.

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