Crossword Genius

On, as an alarm (3)

Ross

I think it could be either:

Which length description are you looking for?:

3

5

set

(Other definitions for set that I've seen before include "carriage" , "Gel; group" , "decline" , "Sink below the horizon" , "Firm, like jelly" .)

I've seen this clue in the Penny Press.
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