Longs for trees (5)
I believe the answer is:
pines
I believe this is a double definition.
'longs for' is the first definition.
(I've seen this in another clue)
'trees' is the second definition.
(pine is a kind of tree)
(Other definitions for pines that I've seen before include "Longs for evergreen trees" , "Yearns for evergreen trees?" , "Yearns for the conifers" , "Coniferous trees" , "Longs for or languishes" .)