Catch in one trap (3)
I believe the answer is:
Here is my best explanation:
'catch' is the definition.
(netting is a kind of catching)
'in one trap' is the subsidiary indication.
'in' says the answer is hidden in the clue.
'net' is hidden within 'one trap'.
(Other definitions for net that I've seen before include "Fish trap and type of goal", "Open mesh; catch", "Open-weave fabric", "Score a goal", "Overall; mesh", "Trap; open-weave fabric", "Trap made from mesh", "Fish-catching mesh", "Fine open-weave fabric" and "Open-meshed material (used for catching things?)".)