Main way to fasten sheets together (6)
I believe the answer is:
staple
'main' is the definition.
(I've seen this before)
'way to fasten sheets together' is the wordplay.
I cannot quite understand how this works, but
'way' could be 'st' (abbreviation for street) and 'st' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for staple that I've seen before include "means of keeping papers together" , "Main - way to fasten paper" , "Fastening wire" , "Basic element" , "Paper pin - basic" .)