Amassed a fortune at the trading centre (5)

I believe the answer is:

piled

'amassed' is the definition.
(I've seen this in another clue)

'a fortune at the trading centre' is the wordplay.
'a fortune' becomes 'pile' (I've seen this in another clue).
'at' is a charade indicator (letters next to each other).
'centre' means to look at the middle letters.
The middle letter of 'trading' is 'd'.
'pile'+'d'='PILED'

(Other definitions for piled that I've seen before include "put in a heap" , "Arranged in stacks" , "Heaped" .)

I've seen this clue in the Evening Standard.

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