Not at work, expecting to receive delivery (2,6)

I believe the answer is:

on strike

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'not at work' is the definition.

'to receive delivery' is the wordplay.
'to receive' becomes 'on' (I can't explain this - if you can you should give a lot more credence to this answer).
'delivery' becomes 'strike' (strike is a kind of delivery).
'on'+'strike'='ON STRIKE'

'expecting' is the link.

Can you help me to learn more?

(Other definitions for on strike that I've seen before include "Refusing to work" , "Involved in industrial action" , "Facing a ball" , "Taking industrial action" .)

I've seen this clue in The Independent.

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