Zeppelin songs? Cool! (7)
I believe the answer is:
airship
'zeppelin' is the definition.
(I've seen this before)
'songs? cool' is the wordplay.
'songs?' becomes 'airs' (I've seen this before).
'cool' becomes 'hip'.
'airs'+'hip'='AIRSHIP'
(Other definitions for airship that I've seen before include "Old flier" , "Zeppelin, for example" , "mode of flying" , "Means of transport" , "flying craft" .)