A French drink, popular and free (7)
I believe the answer is:
unchain
'free' is the definition.
(I've seen this before)
'a french drink popular' is the wordplay.
'a french' becomes 'un' ('a' in French).
'drink' becomes 'cha' (I've seen this before).
'popular' becomes 'in'.
'un'+'cha'+'in'='UNCHAIN'
'and' acts as a link.
(Other definitions for unchain that I've seen before include "Release from fetters" , "Release from bondage" , "Free" , "loose" .)