Moorland plant (7)
I believe the answer is:
heather
'moorland plant' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for heather that I've seen before include "that grows up in the Highlands" , "thing seen on the moors" , "Lassie" , "Moorland shrub" , "Evergreen shrub" .)