As expected, a bit of a fight (3)

I believe the answer is:

due

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'as expected' is the definition.
'due' can be an answer for 'expected' (similar in meaning). I am not sure about the 'as' bit.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for due that I've seen before include "Required; proper" , "Rightful" , "imminent" , "Expected; appropriate" , "Appropriate - fee - requiring payment" .)

I've seen this clue in the Evening Standard.

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