Crossword Genius

Notice a bit of a rash (4)

Ross

I believe the answer is:

spot

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'notice' is the definition.
(spot can mean to notice or observe)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for spot that I've seen before include "20 [MARK]" , "Notice - place" , "Notice; skin blemish" , "Lady Macbeth: ''Out, damned . . . .!''" , "jam > stain" .)

I've seen this clue in The Irish Independent.
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