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Highland beer (about 426ml) (6)

Ross

I believe the answer is:

alpine

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'highland' is the definition.
(similar in meaning)

'beer about 426ml' is the wordplay.
'beer' becomes 'ale' (type of beer).
'about' is an insertion indicator.
'4i6ml' becomes 'pin' (I can't justify this - if you can you should give a lot more credence to this answer).
'ale' going around 'pin' is 'ALPINE'.

Can you help me to learn more?

(Other definitions for alpine that I've seen before include "Relating to a European mountain range" , "Nepali (anag.)" , "Relating to high mountains" , "from Germany, Austria etc" , "Plant of high mountains" .)

I've seen this clue in The Telegraph.
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