Hems around net (4)
I believe the answer is:
mesh
'net' is the definition.
(I know that net can be written as mesh)
'hems around' is the wordplay.
'around' indicates anagramming the letters.
'hems' is an anagram of 'MESH'.
(Other definitions for mesh that I've seen before include "Work well together" , "Interlaced structure" , "Piece of netting" , "Network fabric - engage with it" , "Lattice" .)