Greeting cat, who's barking (6)
I believe the answer is:
wotcha
'greeting' is the definition.
'cat who's barking' is the wordplay.
'barking' indicates anagramming the letters (UK slang for mad).
'cat'+'who'='catwho'
'catwho' is an anagram of 'WOTCHA'.
(Other definitions for wotcha that I've seen before include "Opener" , "Hello!" .)
I've seen this clue in The Times.
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