Barking "woof!", dog tiring at play (7,3,5)
I believe the answer is:
waiting for godot
'play' is the definition.
(Samuel Beckett play)
'barking woof dog tiring at' is the wordplay.
'barking' indicates an anagram ('barking' can informally mean mad).
'woof'+'dog'+'tiring'+'at'='woofdogtiringat'
'woofdogtiringat' anagrammed gives 'WAITING FOR GODOT'.
(Other definitions for waiting for godot that I've seen before include "Drama" , "Samuel Beckett play" .)