Animal experimenter fed canine titbit (7)
I believe the answer is:
morceau
'animal experimenter fed' is the definition.
The definition suggests a singular noun which matches the answer.
'canine titbit' is the wordplay.
I cannot really see how this works, but
'canine' could be 'c' (dental abbreviation) and 'c' is found within the answer.
The remaining letters 'moreau' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for morceau that I've seen before include "Fragment; short literary composition" , "Fragment, morsel (French); EC amour (anag.)" , "piece of music" , "Mime artist" .)