Rainforest climber (5)
I believe the answer is:
liana
'rainforest climber' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for liana that I've seen before include "Jungle climber" , "Climbing jungle plant" , "Climbing-plant" , "Tropical forest climber" , "Climbing plant of rainforests" .)