Collect a great amount (5)

I believe the answer is:

amass

'collect' is the definition.
('amass' can be a synonym of 'collect')

'a great amount' is the wordplay.
'great amount' becomes 'mass'.
'a'+'mass'='AMASS'

(Other definitions for amass that I've seen before include "Build up" , "Be a compiler" , "Collect, hoard" , "Put together" , "Gather in great quantity" .)

I've seen this clue in the Evening Standard.

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