Something that protects quick ascending climber (5)

I believe the answer is:

liana

I'm a little stuck... Click here to teach me more about this clue!

'climber' is the definition.
(climbing plant)

I don't understand how the remainder of the clue works.

(Other definitions for liana that I've seen before include "Jungle climber" , "Woody forest climber" , "Climbing-plant" , "Tropical forest climber" , "Climbing jungle plant" .)

I've seen this clue in The Guardian.

Want a hint initially instead of a full solution? Install my app