Flag officer (6)

I believe the answer is:

ensign

This clue is a double definition.

'flag' is the first definition.
(ensign is a kind of flag)

'officer' is the second definition.
(I've seen this before)

(Other definitions for ensign that I've seen before include "Flag - officer, formerly" , "US naval rank" , "Ship's flag and junior officer" , "Look upon with contempt" , "Ship's flag to show nationality" .)

I've seen this clue in The Telegraph, the Evening Standard, The Sun, The Irish News, The Times, The Globe and Mail and The Guardian.

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