They get together for a bite to eat (5)
I believe the answer is:
teeth
'eat' is the definition.
Although both the answer and definition are verbs in their base form, I don't understand how one could define the other.
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for teeth that I've seen before include "One may be armed to them" , "Food may get stuck in them" , "Incisors maybe" , "Eg, canines, incisors" , "They're to be found on a gear-wheel" .)