Intoxicated in snug? (5)
I believe the answer is:
tight
This clue is a double definition.
'intoxicated' is the first definition.
(similar in meaning)
'snug?' is the second definition.
(similar in meaning)
'in' is the link.
(Other definitions for tight that I've seen before include "Squeezed" , "Penny-pinching" , "Hard to move; drunk" , "Drunk; giving little room" , "Tense; secretive" .)