Delight for mad cats? Yes! (7)
I believe the answer is:
ecstasy
'delight' is the definition.
(I have seen 'Great delight ' mean 'ecstasy' so perhaps 'delight' could also mean 'ecstasy')
'mad cats? yes' is the wordplay.
'mad' is an anagram indicator.
'cats'+'yes'='catsyes'
'catsyes' anagrammed gives 'ECSTASY'.
'for' is the link.
(Other definitions for ecstasy that I've seen before include "Feeling of great rapture" , "Bliss, rapture" , "transport" , "Feeling of great joy" , "State of bliss or euphoria" .)