Fits together (6)
I believe the answer is:
meshes
'fits together' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for meshes that I've seen before include "Becomes entangled or fits together" , "Engages with others - using nets?" , "Fits into, intertwines" , "gets engaged" , "Interlockings, nets" .)