Time limit no sound (8)

I believe the answer is:

deadline

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'time limit' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for deadline that I've seen before include "Latest time for completion" , "a writer may have to meet" , "Latest time for doing something" , "Fixed completion date" , "Time by which task must be completed" .)

I've seen this clue in the Sydney Morning Herald.

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