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Nervously ran into river in very cold region? (3,5)

Ross

I believe the answer is:

far north

'very cold region?' is the definition.
(in the Arctic)

'nervously ran into river' is the wordplay.
'nervously' indicates anagramming the letters.
'into' means one lot of letters goes inside another.
'river' becomes 'forth' (Scottish river).
'ran' anagrammed gives 'arn'.
'arn' put within 'forth' is 'FAR NORTH'.

'in' is the link.

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