Sharp turn (5)

I think it could be either:

Which length description are you looking for?:

sheer

I believe this is a double definition.

'sharp' is the first definition.
(thesaurus)

'turn' is the second definition.
(sheering is a kind of turning)

(Other definitions for sheer that I've seen before include "Absolutely - diaphanous" , "Complete" , "Deviate (from) - vertical" , "Utter - precipitous" , "Gossamer or precipitous" .)

I've seen this clue in The Times.

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