Feline energy excited corgi, that's clear (9)
I believe the answer is:
categoric
'clear' is the definition.
Both the definition and answer are adjectives. Perhaps there's a link between them I don't understand?
'feline energy excited corgi' is the wordplay.
'feline' becomes 'cat' (cat is a kind of feline).
'energy' becomes 'e' (physics symbol as in E=mc2).
'excited' is an anagram indicator.
'corgi' is an anagram of 'goric'.
'cat'+'e'+'goric'='CATEGORIC'
'that's' acts as a link.
Can you help me to learn more?
(Other definitions for categoric that I've seen before include "Positive" , "Unambiguously direct" , "Unambiguously explicit" , "Unconditional" , "Unqualified" .)