It's like a wide mouth, and you can hear it bite (5)
I believe the answer is:
bight
'bite' is the definition.
The answer and definition can be both to do with contact as well as being verbs in their base form.
Perhaps there's a link between them I don't understand?
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for bight that I've seen before include "loop of rope?" , "Large broad bay -- middle part of a slack rope" , "Wide bay" , "Bay - bend in rope" , "Curve of shore" .)