Crossword Genius

Tapering flag for military or nautical use (6)

Ross

I believe the answer is:

pennon

(Other definitions for pennon that I've seen before include "Ship's tapering flag" , "one might be all of a flutter" , "Long flag, often tapering" , "Long narrow triangular flag" , "Knight's personal flag" .)

I've seen this clue in The Times.
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