Zeppelin tune's welcome on piano (7)
I believe the answer is:
airship
'zeppelin' is the definition.
(thesaurus)
'tune's welcome on piano' is the wordplay.
'tune's' becomes 'airs' ('air' can be a synonym of 'tune').
'welcome' becomes 'hi' (I've seen this in other clues).
'on' is a charade indicator (letters next to each other).
'piano' becomes 'p'.
'airs'+'hi'+'p'='AIRSHIP'
(Other definitions for airship that I've seen before include "Means of transport" , "mode of flying" , "Dirigible" , "Blimp" , "Lighter-than-air craft" .)