Crossword Genius

Popular old routine? Not accurate (7)

Ross

I believe the answer is:

inexact

'not accurate' is the definition.
(I've seen this before)

'popular old routine?' is the wordplay.
'popular' becomes 'in'.
'old' becomes 'ex'.
'routine?' becomes 'act' (routine is a kind of act).
'in'+'ex'+'act'='INEXACT'

(Other definitions for inexact that I've seen before include "Not precise, like some sciences" , "Lax" , "Not entirely accurate" , "Not quite right" , "Not precise, ambiguous" .)

I've seen this clue in The Times.
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