Identify corgi seen barking (9)
I believe the answer is:
recognise
'identify' is the definition.
(I've seen this before)
'corgi seen barking' is the wordplay.
'barking' indicates anagramming the letters (UK slang for mad).
'corgi'+'seen'='corgiseen'
'corgiseen' with letters rearranged gives 'RECOGNISE'.
(Other definitions for recognise that I've seen before include "Identify as previously known" , "Know from having seen before" , "Acknowledge value" , "See" , "Identify - know" .)