Intellectual happy with Boris's opening argument (8)

I believe the answer is:

highbrow

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'intellectual' is the definition.
(I know that highbrow is a type of intellectual)

'happy with boris's opening argument' is the wordplay.
'happy with' becomes 'high' (I can't justify this - if you can you should give a lot more credence to this answer).
'opening' indicates taking the first letters.
'argument' becomes 'row' (to row is to argue).
The first letter of 'boriss' is 'b'.
'high'+'b'+'row'='HIGHBROW'

Can you help me to learn more?

(Other definitions for highbrow that I've seen before include "Intellectual - cultured" , "Person of erudite tastes" , "Highly cultured or educated" , "Intellectual with lofty forehead?" .)

I've seen this clue in The Sun.

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