The biting part? (3)
I believe the answer is:
bit
'part?' is the definition.
(both mean a piece of something)
'the biting' is the wordplay.
I cannot quite see how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is located in the answer.
The remaining letters 'bi' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for bit that I've seen before include "Unspoken" , "Between horse's teeth, this loses control" , "Small portion - part of drill" , "Cutting head of a drill" , "Took effect - fragment" .)