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' indicates the answer is hidden within the clue.
'NET' is hidden within 'pine trees'.
'set' acts as a 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" .)