He ranks very high in Wales (7)

I believe the answer is:
snowdon
'high in wales' is the definition.
The definition suggests a singular noun which matches the answer.
'he ranks' is the wordplay.
I cannot quite see how this works, but
'he' could be 'don' and 'don' is found in the answer.
The remaining letters 'snow' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'very' acts as a link.
Can you help me to learn more?
(Other definitions for snowdon that I've seen before include "Highest mountain in Wales" , "Highest peak in Wales" , "Highest Welsh peak" , "High spot in Wales" , "Highest point of England and Wales" .)
