Gather a crowd (5)

I believe the answer is:

amass

'gather' is the definition.
(amass can mean to collect or gather)

'a crowd' is the wordplay.
'crowd' becomes 'mass' (massing is a kind of crowding).
'a'+'mass'='AMASS'

(Other definitions for amass that I've seen before include "Accumulate, heap up" , "Stock up on" , "Get together" , "Stockpile" , "Gathers" .)

I've seen this clue in The Telegraph.

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