Quite unusual to find the French drink (7)
I believe the answer is:
tequila
'drink' is the definition.
(tequila is a kind of drink)
'quite unusual to find the french' is the wordplay.
'unusual' indicates anagramming the letters.
'to find' is a charade indicator (letters next to each other).
'the french' becomes 'la'.
'quite' is an anagram of 'tequi'.
'tequi'+'la'='TEQUILA'
(Other definitions for tequila that I've seen before include "Distilled agave drink" , "one in the slammer" , "Cocktail -- 1988 American crime film -- equaliser units (anag)" , "Equal it! (anag)" , "Mexican tipple" .)