Cool cat sounds spooky? (7)
I believe the answer is:
phantom
'spooky?' is the definition.
Both the definition and answer are adjectives. Maybe you can see a link between them that I can't see?
'cool cat sounds' is the wordplay.
I cannot really understand how this works, but
'cat' could be 'tom' (a tom is a male cat) and 'tom' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for phantom that I've seen before include "Ghost of the Opera" , "Spirit" , "Ballet-dancing costume" , "Wraith" , "shadow of his former self?" .)