Bear contemptuous expression as high official (4-3)
I believe the answer is:
pooh-bah
'high official' is the definition.
'pooh bah' can be an answer for 'official' (I have seen 'pompous official' mean 'pooh bah' so perhaps 'official' could also mean 'pooh bah'). I'm unsure of the 'high' bit.
'bear contemptuous expression' is the wordplay.
'bear' becomes 'pooh' (Winnie the Pooh).
'contemptuous expression' becomes 'bah' (expression of disapproval, as in 'bah humbug!').
'pooh'+'bah'='POOH-BAH'
'as' acts as a link.
Can you help me to learn more?
(Other definitions for pooh-bah that I've seen before include "Arrogant person of importance" , "Pompous office-holder" , "Pompous official" .)