God of wine (7)
I believe the answer is:
'god of wine' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for bacchus that I've seen before include "Roman god of drink and revelry" , "Greek god of wine, also called Dionysus" , "Divinity" , "Greek god of drink, also called Dionysus" , "Greek god of booze" .)