Crossword Genius

Possible target for repairing telephone problem (8)

Ross

I believe the answer is:

deadline

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

'problem' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

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

Can you help me to learn more?

(Other definitions for deadline that I've seen before include "Time-limit as for reporter's copy" , "Time-limit as for journalist's copy" , "last possible time" , "a writer may have to meet" , "Time by which task must be completed" .)

I've seen this clue in The Independent.
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