Crossword Genius

I interrupted the devious drama and left with an officer (7)

Ross

I believe the answer is:

admiral

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'officer' is the definition.
(admiral is a kind of officer)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for admiral that I've seen before include "(White or red) butterfly" , "Navy chief" , "Red butterfly at sea?" , "Senior officer; mad liar (anag.)" , "Naval high-up" .)

I've seen this clue in the Evening Standard.
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