One bent on making a sharp turn? (7)

I believe the answer is:

hairpin

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'turn?' is the definition.
(thesaurus)

I don't understand how the remainder of the clue works.

(Other definitions for hairpin that I've seen before include "description of the bends?" , "Fastener for tresses" , "A very sharp bend, u-shaped" , "Nasty road bend or aid to coiffure" , "Sharp type of bend" .)

I've seen this clue in the Evening Standard.

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