Crossword Genius

A river and, on the side, a region (3)

Ross

I believe the answer is:

tay

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'a river' is the definition.
(Scottish river)

'on the side a region' is the wordplay.
'on' is a charade indicator (letters next to each other).
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'side a region' becomes 'ay' (I can't justify this - if you can you should give a lot more credence to this answer).
't' next to 'ay' is 'TAY'.

'and' acts as a link.

Can you help me to learn more?

(Other definitions for tay that I've seen before include "Longest river of Scotland" , "Scottish loch" , "Bridge at Dundee" , "Scottish river and firth" , "The - Bridge Disaster (McGonagall)" .)

I've seen this clue in the Evening Standard.
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