Initially beau gagging for it - that’s fine maybe (6)
I believe the answer is:
brandy
'fine maybe' is the definition.
(fine is a type of brandy)
'initially beau gagging for it' is the wordplay.
'initially' indicates taking the first letters.
'gagging for it' becomes 'randy' (both can mean sexually aroused).
The first letter of 'beau' is 'b'.
'b'+'randy'='BRANDY'
'that's' acts as a link.
(Other definitions for brandy that I've seen before include "Samuel Johnson's drink fit for heroes" , "Strong spirit distilled from wine" , "eg Armagnac" , "Cognac, perhaps" , "Strong alcoholic spirit" .)