Star guide to note (8)

I believe the answer is:

asterisk

This clue is a double definition.

'star' is the first definition.
('asterisk' can be a synonym of 'star')

'guide to note' is the second definition.

(Other definitions for asterisk that I've seen before include "Printer's star" , "Printed star" , "Star-shaped character used in printing" , "Star for the printer" , "Text-marking symbol" .)

I've seen this clue in The Guardian.

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