Rambling on downs and upland (7)
I believe the answer is:
snowdon
'upland' is the definition.
Both the answer and definition are singular nouns.
Perhaps they are linked in a way I don't understand?
'rambling on downs' is the wordplay.
'rambling' is an anagram indicator.
'on'+'downs'='ondowns'
'ondowns' with letters rearranged gives 'SNOWDON'.
'and' is the link.
Can you help me to learn more?
(Other definitions for snowdon that I've seen before include "Highest peak in Wales" , "Highest Welsh peak" , "Highest point of England and Wales" , "that is looked up to in Wales" , "Highest mountain in Wales" .)