Oslo occasionally depressing me a bit (4)
I believe the answer is:
some
'a bit' is the definition.
(I've seen this in another clue)
'oslo occasionally depressing me' is the wordplay.
I cannot quite understand how this works, but
'me' is within the answer.
The remaining letters 'so' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for some that I've seen before include "Hard work" , "Part" , "Several" , "Undefined number" , "A little; not a little" .)