Scottish drink imbibed by cold couple of chaps (10)

I believe the answer is:

caledonian

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'scottish' is the definition.
(Caledonian means relating to Scotland)

'drink imbibed by cold couple of chaps' is the wordplay.
I cannot really see how this works, but
'drink' could be 'ale' (type of beer) and 'ale' is present in the answer.
'cold' could be 'c' (eg on taps) and 'c' is present in the answer.
'of' could be 'o' and 'o' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for caledonian that I've seen is " Scots".)

I've seen this clue in The Times.

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