Bind together (4)
I believe the answer is:
knit
'bind together' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for knit that I've seen before include "mesh" , "Use needles to make clothes" , "Interweave" , "Make a sweater, maybe" , "Tighten (eyebrows) in a frown; unite" .)