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In the West Country, a Scots boy with a warm heart (5)

Ross

I believe the answer is:

tamar

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

'in the west country a scots' is the definition.
I can't tell whether this definition defines the answer.

'boy with a warm heart' is the wordplay.
'boy' becomes 'tam' ().
'with' is a charade indicator (letters next to each other).
'heart' says to take the centre.
The middle letters of 'warm' are 'ar'.
'tam'+'ar'='TAMAR'

Can you help me to learn more?

(Other definitions for tamar that I've seen before include "River of Devon-Cornwall border" , "woman who posed as a prostitute" , "Devon-Cornwall boundary river" , "River of SW England" , "River forming West Country boundary" .)

I've seen this clue in the Evening Standard.
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