Accumulate a great amount (5)

I believe the answer is:

amass

'accumulate' is the definition.
(synonyms)

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

(Other definitions for amass that I've seen before include "Collect or gather" , "Sodium chloride" , "Gathers" , "Stock up on" , "store" .)

I've seen this clue in The Globe and Mail.

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