More than one tree languishes (5)
I believe the answer is:
pines
I believe this clue is a double definition.
'more than one tree' is the first definition.
(pine is a kind of tree)
'languishes' is the second definition.
('pine' can be a synonym of 'languish')
(Other definitions for pines that I've seen before include "Yearns for evergreen trees?" , "Longs for or languishes" , "Longs for evergreen trees" , "Coniferous trees" , "Yearns for the conifers" .)