Crossword Genius

Unmissable date — and phone not working? (8)

Ross

I believe the answer is:

deadline

'unmissable date' is the definition.

I can't explain the rest of the clue.

(Other definitions for deadline that I've seen before include "Time-limit as for reporter's copy" , "Latest time for doing something" , "Latest time for completion" , "Time-limit as for journalist's copy" , "Target time" .)

I've seen this clue in The Guardian.
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