Crossword clue: a bag in which feed for a horse, ox, or the like, may be fastened under the nose by a string passing over the head.
1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).
Possible answers
a canvas bag that is used to feed an animal (such as a horse); covers the muzzle and fastens at the top of the head