Note the barking canines, for example (5)
I believe the answer is:
'canines for example' is the definition.
(canine is a kind of tooth)
'note the barking' is the wordplay.
'note' becomes 'te' (musical note).
'barking' indicates an anagram (UK slang for mad).
'the' is an anagram of 'eth'.
(Other definitions for teeth that I've seen before include "watchdog needs these" , "Gearwheel projections" , "Saw or gearwheel items" , "Bony structures for eating" , "Canines, for example" .)