Obliquely question expert about the capital of Norway (7)
I believe the answer is:
askance
'obliquely' is the definition.
(I've seen this before)
'question expert about the capital of norway' is the wordplay.
'question' becomes 'ask'.
'expert' becomes 'ace' (ace is a kind of expert).
'about' indicates putting letters inside.
'the capital of norway' becomes 'n' (I can't justify this - if you can you should give a lot more credence to this answer).
'ace' placed around 'n' is 'ance'.
'ask'+'ance'='ASKANCE'
Can you help me to learn more?
(Other definitions for askance that I've seen before include "(Look) suspiciously or sceptically" , "Look this way in doubt or suspicion" , "Sideways (of look)" , "(Look) disapprovingly" , "Sideways (of glance)" .)