Crossword Genius

Maine, a certain size (7)

Ross

I believe the answer is:

measure

'size' is the definition.
(thesaurus)

'maine a certain' is the wordplay.
'maine' 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 "Extent" , "Gauge" , "See 6" , "amount of drink" , "drink in an American bar" .)

I've seen this clue in The Telegraph.
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