Directed to consume whiskey? That’s obscene! (4)
I believe the answer is:
lewd
'obscene' is the definition.
(synonyms)
'directed to consume whiskey?' is the wordplay.
'directed' becomes 'led' ('lead' can be a synonym of 'direct').
'to consume' means one lot of letters goes inside another.
'whiskey?' becomes 'w' (alpha bravo charlie delta ...).
'led' going around 'w' is 'LEWD'.
'that's' is the link.
(Other definitions for lewd that I've seen before include "Indecent, licentious" , "Salacious" , "Indecent and vulgar (4)" , "Obscene, indecent" , "Sexually crude" .)