Crossword Genius

Parcel yields I've corrupted, arriving outside normal times (7,8)

Ross

I believe the answer is:

special delivery

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

'arriving outside normal times' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'parcel yields i've corrupted' is the wordplay.
'corrupted' indicates anagramming the letters.
'parcel'+'yields'+'ive'='parcelyieldsive'
'parcelyieldsive' with letters rearranged gives 'SPECIAL DELIVERY'.

Can you help me to learn more?

(Other definitions for special delivery that I've seen before include "that a spinner hopes to produce?" , "What a courier may have brought" .)

I've seen this clue in The Irish Times.
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