In North America, the principal unmarried attendant of a bride (4,2,6)

I believe the answer is:

maid of honour

(Other definitions for maid of honour that I've seen before include "Cake" , "plays a prominent part at US wedding" , "Bride's "best woman"?" , "royal attendant" , "bride's attendant, surely!" .)

I've seen this clue in The Independent.

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