Hairdresser's unit of length (4)

I believe the answer is:

inch

(Other definitions for inch that I've seen before include "25.4 millimetres" , "Move very slowly - a very short distance" , "0.0254 metre" , "Islet (Scots); twenty-five.four mm" , "Subdivision of 14 down" .)

I've seen this clue in the USA Today.

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