Crossword Genius

Open a French Sancerre's first and finest (6)

Ross

I believe the answer is:

unstop

'open' is the definition.
(thesaurus)

'a french sancerre's first and finest' is the wordplay.
'a french' becomes 'un' ('a' in French).
'first' suggests taking the first letters.
'and' says to put letters next to each other.
'finest' becomes 'top' (I've seen this before).
The first letter of 'sancerre' is 's'.
'un'+'s'+'top'='UNSTOP'

(Another definition for unstop that I've seen is " Open".)

I've seen this clue in The Telegraph.
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