I object to a certain extent (7)

I believe the answer is:

measure

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

'i object to a certain' is the wordplay.
'i object' becomes 'me'.
'certain' becomes 'sure' ('sure' can be a synonym of 'certain').
'me'+'a'+'sure'='MEASURE'

(Other definitions for measure that I've seen before include "Tape" , "Action - amount" , "The size of a dance" , "Assess; rhythm" , "Establish the size" .)

I've seen this clue in The Telegraph and The Guardian.

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