Climb on Snowdon? (5)
I believe the answer is:
mount
This clue could be a double definition.
'climb on' is the first definition.
(synonyms)
'snowdon?' is the second definition.
Both the answer and definition are singular nouns.
Perhaps you can see a link between them that I can't see?
Can you help me to learn more?
(Other definitions for mount that I've seen before include "Get on top of; frame" , "Steed" , "Ascend; horse" , "stage" , "hill" .)