Attic's in a mess -- it's shocking! (6)
I believe the answer is:
static
'shocking' is the definition.
Both the answer and definition are adjectives. Maybe you can see a link between them that I don't see?
'attic's in a mess' is the wordplay.
'in a mess' indicates an anagram.
'attics' is an anagram of 'STATIC'.
'it's' is the link.
Can you help me to learn more?
(Other definitions for static that I've seen before include "That's shocking!" , "Changeless" , "Crackling or hissing noise caused by electrical interference" , "Still, not moving" , "Inert or passive, like some electricity" .)