Zeppelin tune, then leader to smoke joint! (7)
I believe the answer is:
airship
'zeppelin' is the definition.
(I've seen this before)
'tune then leader to smoke joint' is the wordplay.
'tune' becomes 'air' (air can mean a piece of music).
'then' is a charade indicator (letters next to each other).
'leader to' indicates taking the first letters (the letter which leads the word).
'joint' becomes 'hip' (hip is a kind of joint).
The initial letter of 'smoke' is 's'.
'air'+'s'+'hip'='AIRSHIP'
(Other definitions for airship that I've seen before include "Gas-filled craft" , "High-flyer" , "Means of transport" , "Dirigible" , "Flying machine" .)