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Commanding Yorkshire's top region once (10)

Ross

I believe the answer is:

bestriding

I'm a little stuck... Click here to teach me more about this clue!

'commanding yorkshire's' is the definition.
I can't tell whether this defines the answer.

'top region once' is the wordplay.
'top' becomes 'best' (associated in meaning).
'region once' becomes 'riding' (I can't justify this - if you can you should believe this answer much more).
'best'+'riding'='BESTRIDING'

Can you help me to learn more?

(Another definition for bestriding that I've seen is " Dominating".)

I've seen this clue in The Times.
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