Crossword Genius

Due date that's not welcomed by caller? (8)

Ross

I believe the answer is:

deadline

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This might be a double definition.

'due date' is the first definition.
The answer and definition can be both related to time as well as being singular nouns.
Maybe you can see an association between them that I don't see?

'not welcomed by caller?' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'that's' acts as a link.

Can you help me to learn more?

(Other definitions for deadline that I've seen before include "Time-limit as for journalist's copy" , "that shouldn't be missed?" , "Time limit as for journalists filing copy" , "Time by which journalist must file copy" , "Cut-off point" .)

I've seen this clue in The Sun.
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