Party with dry, mostly red booze (7)
I believe the answer is:
campari
'red booze' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.
'party with dry mostly' is the wordplay.
'party' becomes 'camp' (both can mean a group of people).
'with' says to put letters next to each other.
'dry' becomes 'arid' (similar in meaning).
'mostly' means to remove the last letter (most but not all of the word).
'arid' with its last letter taken away is 'ari'.
'camp'+'ari'='CAMPARI'
Can you help me to learn more?
(Other definitions for campari that I've seen before include "Mildly bitter aperitif, often drunk with soda" , "Pinkish aperitif" , "bitter drink" , "Red, bitter-sweet Italian aperitif" .)