Humorous aspect of Spooner's nature affecting all Oxford? (8)

'humorous' is the definition.
Although both the answer and definition are adjectives, I don't see how one could define the other.

'aspect of spooner's nature affecting all oxford?' is the wordplay.
I cannot really see how this works, but
'oxford?' could be 'city' (oxford is a kind of city) and 'city' is found within the answer.
The remaining letters 'wide' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?