Crossword Genius

Rat (on) (4)

Ross

I believe the answer is:

tell

(Other definitions for tell that I've seen before include "blow the whistle" , "Inform - count - Swiss hero" , "Count - recount" , "Rossini composed opera 'William ....'" , "One who refused to accept tyranny" .)

I've seen this clue in the LA Times, The Washington Post and the Universal.
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