The cul-de-sac all mortals reach (4,3)

I believe the answer is:

dead end

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'the cul-de-sac' is the definition.
('dead end' can be a synonym of 'cul-de-sac')

I can't explain the rest of the clue.

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(Other definitions for dead end that I've seen before include "A blind alley, sounds moribund" , "Blind alley, cul-de-sac" , "going nowhere" , "Where no progress can be made" , "that's leading nowhere" .)

I've seen this clue in The Globe and Mail.

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