Climber established restaurant (3)
I believe the answer is:
ivy
This could be a double definition.
'climber' is the first definition.
(ivy is a climbing plant)
'established restaurant' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
Can you help me to learn more?
(Other definitions for ivy that I've seen before include "Creeper plant" , "Clinging, parasitical plant" , "Old World vine" , "Evergreen creeping plant" , "The Hedera genus of evergreen climbers" .)