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If C.O.'s harmed, it's a dramatically treacherous time (4,2,5)

Ross

I believe the answer is:

ides of march

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'time' is the definition.

'if c o 's harmed it's a dramatically treacherous' is the wordplay.
'if c o 's harmed' can be anagrammed to 'IDES OF MARCH'.
Though, I'm not clear how the anagram is indicated.

Can you help me to learn more?

(Another definition for ides of march that I've seen is " That fateful day".)

I've seen this clue in The Irish News.
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