Palms and pines (5)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
trees
(Other definitions for trees that I've seen before include "Elms, pines etc" , "Woods" , "Long lock of hair" , "Tall, perennial, woody plant" , "''I see ... of green / Red roses too'' (What a Wonderful World)" .)