President sounds sustained by it (6)

I believe the answer is:

macron

I believe this is a double definition.

'president' is the first definition.
(French president Emmanuel Macron)

'sounds sustained by it' is the second definition.
(diacritic mark indicated a sound is sustained)

(Another definition for macron that I've seen is " French president".)

I've seen this clue in The Guardian.

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