Woman's top that fastens behind the neck, leaving back and arms uncovered (6)

I believe the answer is:

halter

(Other definitions for halter that I've seen before include "Tether" , "Rope or leather strap for tying up horse" , "Hangman's rope" , "Rope for leading a horse" , "backless bodice" .)

I've seen this clue in The Guardian.

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