Sticky pine product (5)
I believe the answer is:
resin
'sticky pine product' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for resin that I've seen before include "eg Rosin" , "Exudation from fir trees" , "Sticky material" , "Rinse out this substance from trees" , "Sticky tree exudation" .)