Crossword Genius

Notes appeal for help (3)

Ross

I believe the answer is:

sos

I believe this is a double definition.

'notes' is the first definition.
(more than one so, a musical note)

'appeal for help' is the second definition.
(I've seen this before)

(Other definitions for sos that I've seen before include "Distress call" , "Help with dots and dashes" , "Appeal for help" , "International distress code" , "urgent appeal" .)

I've seen this clue in The Times.
Want a hint initially instead of a full solution? Install my app