Backed excellent drink with this cigar (7)
I believe the answer is:
regalia
'this cigar' is the definition.
(type of cigar)
'backed excellent drink' is the wordplay.
'backed' shows that the letters should be reversed in order.
'excellent' becomes 'ai'.
'drink' becomes 'lager' (lager is a kind of drink**).
'ai'+'lager'='ailager'
'ailager' in reverse letter order is 'REGALIA'.
'with' is the link.
(Other definitions for regalia that I've seen before include "Finery" , "Crown, sceptre etc used at a coronation" , "ceremonial gear" , "Orb and sceptre, for example" , "Ceremonial trimmings of high office" .)