Mark placed over a vowel such as that over the o in French location the Côte d'Azur (10)
I believe the answer is:
circumflex
(Other definitions for circumflex that I've seen before include "Diacritical mark over a vowel -- fix cruel MC (anag)" , "Accent" , "Diacritical mark above a vowel in some languages" .)
I've seen this clue in The Mirror.
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