Crossword Genius

Open a French bar (6)

Ross

I believe the answer is:

unbolt

'open' is the definition.
(unbolting is a kind of opening)

'a french bar' is the wordplay.
'a french' becomes 'un' ('a' in French).
'bar' becomes 'bolt' (bolt is a kind of bar).
'un'+'bolt'='UNBOLT'

(Other definitions for unbolt that I've seen before include "Open" , "Unlock" .)

I've seen this clue in The Irish Times.
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