Complete reversal (1-4)

I think it could be either:

Which length description are you looking for?:

1-4

5-4

u-turn

'complete reversal' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for u-turn that I've seen before include "180deg change of direction" , "Complete change of direction" , "Complete reversal of car or attitude" , "A complete reverse of direction" , "Complete reversal of direction or policy" .)

I've seen this clue in The Times.

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