Crossword Genius

Sadly depleted by 550, let's suppose (3)

Ross

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 remainder of the clue.

Can you help me to learn more?

(Other definitions for say that I've seen before include "Authority to influence decision" , "Opportunity to influence < > state" , "Verbalise" , "Utter; e.g." , "Aver" .)

I've seen this clue in the Evening Standard.
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