Crossword Genius

Figure you grind down (8)

Ross

I believe the answer is:

thousand

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'figure' is the definition.
(I've seen this before)

'you grind down' is the wordplay.
'you' becomes 'thou' (historical second person pronoun).
'grind down' becomes 'sand' (I can't explain this - if you can you should believe this answer much more).
'thou'+'sand'='THOUSAND'

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(Other definitions for thousand that I've seen before include "Ten cubed" , "See 1 down" , "a couple of monkeys in total?" , "in MCC, but missing double century" , "See 19 Across" .)

I've seen this clue in The Times and The Sun.
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