Hair used in Chartres salons (5)
I believe the answer is:
tress
'hair' is the definition.
(I know that tress is a type of coif)
'in chartres salons' is the wordplay.
'in' indicates the answer is hidden within the clue.
'TRESS' can be found hidden inside 'chartres salons'.
'used' acts as a link.
(Other definitions for tress that I've seen before include "Long piece of hair" , "Obsolete support" , "Long lock or plait of hair" , "Switch" , "Curl - lock" .)