Crossword Genius

Do what’s required as couriers are expected to? (7,3,5)

Ross

I believe the answer is:

deliver the goods

I'm a little stuck... Click here to teach me more about this clue!

'couriers are expected to?' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'do what's required as' is the wordplay.
I cannot quite understand how this works, but
'as' could be 'eg' ('as' and 'e.g.' can both mean for example) and 'eg' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for deliver the goods that I've seen before include "It could be the lorry driver's job to do this" , "Carry out what is required" .)

I've seen this clue in The Times.
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