Rough estimate (13)

I believe the answer is:

approximation

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

This is the entire clue.

(Other definitions for approximation that I've seen before include "Rough estimate" , "Likeness - guess" , "It's roughly right" , "Fairly close estimate" .)

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

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