Crossword Genius

First symptoms (5)

Ross

I believe the answer is:

onset

'first symptoms' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for onset that I've seen before include "starting?" , "Attack using stone" , "Initial stage; attack" , "Kick-off" , "Beginning; military attack" .)

I've seen this clue in the Penny Press.
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