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Future commanding officer and king for thirty-one days (7)

Ross

I believe the answer is:

october

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'thirty-one days' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for october that I've seen before include "The Hunt for Red . . . . . . . (film)" , "Bore cot out at this time" , "could be a revolution" , "Revolutionary period" , "Russian Revolution month" .)

I've seen this clue in The Times.
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