Degenerate dons curse sign of slowing down (5,5)
I believe the answer is:
brake light
'sign of slowing down' is the definition.
(a brake light shows a driver is braking)
'degenerate dons curse' is the wordplay.
'degenerate' becomes 'rake' (rake can mean an immoral man).
'dons' is an insertion indicator (don can mean to wear or be covered in).
'curse' becomes 'blight' (blight can mean a curse or affliction).
'rake' put into 'blight' is 'BRAKE LIGHT'.
(Another definition for brake light that I've seen is " Device that signals when a car is slowing".)
I've seen this clue in The Times.
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