Sadly robbed of five hundred pounds, let's suppose (3)

I believe the answer is:

say

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'suppose' is the definition.
(I know that suppose can be written as say)

I can't explain the rest of the clue.

(Other definitions for say that I've seen before include "Utter, recite" , "Pronounce" , "Utter; for example" , "State; for instance" , "power" .)

I've seen this clue in the Evening Standard.

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