Rings brought in to support climbing plant (9)
I believe the answer is:
groundsel
'plant' is the definition.
The answer is an example.
'rings brought in to support climbing' is the wordplay.
'rings' becomes 'rounds' ('round' can be a synonym of 'ring').
'brought in to' is an insertion indicator.
'support climbing' becomes 'gel' (I can't justify this - if you can you should give a lot more credence to this answer).
'rounds' placed within 'gel' is 'GROUNDSEL'.
Can you help me to learn more?
(Other definitions for groundsel that I've seen before include "feed to the birds" , "plant, unwanted?" , "Common weed" , "Plant of daisy family" .)