Trap set among pine trees (3)
I believe the answer is:
net
'trap' is the definition.
(net is a type of trap)
'among pine trees' is the wordplay.
'among' says the answer is hidden in the clue.
'NET' is hidden within 'pine trees'.
'set' is the link.
(Other definitions for net that I've seen before include "Open-mesh fabric" , "Open mesh; catch" , "Clear profit or gain" , "Fish trap after deductions?" , "Tennis court feature" .)