Tennis court divider (3)
I believe the answer is:
'tennis court divider' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for net that I've seen before include "Fish trap after deductions?" , "Clear profit or gain" , "Catch; fine fabric" , "Catch -- after all deductions" , "Catch, ensnare" .)