It gets snowed on, obviously (7)

I believe the answer is:

snowdon

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'it gets snowed' is the definition.
The definition suggests a singular noun which matches the answer.

'on obviously' is the wordplay.
I cannot really understand how this works, but
'on' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for snowdon that I've seen before include "High spot in Wales" , "Welsh mountain" , "Highest peak in Wales" , "Highest point of England and Wales" , "Highest Welsh peak" .)

I've seen this clue in the Evening Standard.

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