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More refined Conservative right to block maverick (9)

Ross

I believe the answer is:

courtlier

'more refined' is the definition.
(I've seen this in another clue)

'conservative right to block maverick' is the wordplay.
'conservative' becomes 'C' (UK political abbreviation).
'right' becomes 'r' (common abbreviation).
'to block' is an insertion indicator (block can mean to fill a hole in something).
'maverick' becomes 'outlier'.
'r' placed into 'outlier' is 'ourtlier'.
'c'+'ourtlier'='COURTLIER'

I've seen this clue in The Guardian.
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