Lingo, tad barking? (3,5)
I believe the answer is:
dog latin
'lingo tad barking?' is the definition.
I can't judge whether this defines the answer.
'lingo tad barking?' is the wordplay.
'barking?' indicates an anagram (UK slang for mad).
'lingo'+'tad'='lingotad'
'lingotad' with letters rearranged gives 'DOG-LATIN'.
(Other definitions for dog latin that I've seen before include "Phony language" , "Spurious classical language" .)