Uncommon, a French drink one normally orders (7)
I believe the answer is:
unusual
'uncommon' is the definition.
(associated in meaning)
'a french drink one normally orders' is the wordplay.
'a french' becomes 'un' ('a' in French).
'drink one normally orders' becomes 'usual' (usual please, barman).
'un'+'usual'='UNUSUAL'
(Other definitions for unusual that I've seen before include "Not normal, strange" , "Peculiar" , "Abnormal" , "Not common or ordinary" , "Not habitually or commonly occurring" .)