Crossword Genius

Demanded changes after Mike leaves cul-de-sac (4,3)

Ross

I believe the answer is:

dead end

'cul-de-sac' is the definition.
(synonyms)

I cannot understand how the remainder of the clue works.

(Other definitions for dead end that I've seen before include "that's leading nowhere" , "A blind alley, sounds moribund" , "going nowhere" , "Blind alley or situation without prospects" , "Blind alley, cul-de-sac" .)

I've seen this clue in The Times.
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