100 rhinos travelling from south-west? (7)

I believe the answer is:

cornish

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

'from south-west?' is the definition.
I can't judge whether this definition defines the answer.

'100 rhinos travelling' is the wordplay.
'100' becomes 'C' (Roman numeral).
'travelling' is an anagram indicator.
'rhinos' is an anagram of 'ornish'.
'c'+'ornish'='CORNISH'

Can you help me to learn more?

(Other definitions for cornish that I've seen before include "From a far SW county" , "A Celtic language" , "Rich son (anag)" , "West Country" .)

I've seen this clue in The Times.

Want a hint initially instead of a full solution? Install my app