Used teeth to eat a tempting morsel (4)
I believe the answer is:
bait
'morsel' is the definition.
(thesaurus)
'used teeth to eat a tempting' is the wordplay.
I cannot really see how this works, but
'a' is present in the answer.
The remaining letters 'bit' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for bait that I've seen before include "Annoy; enticement" , "A lure to catch fish" , "What lures" , "Food to entice fish; taunt" , "Used to lure fish or other animals into danger" .)