I have completed the grid but the word highlighted in green (which is the answer) doesn't make sense to me. I think the answer should be FIREBRAND but the numbered squares make the word FIRUBRAND which as far as I know is not even a proper word. Anyone got any idea???
Just found the puzzle - 17d Either of the two rings or loops on a horse's harness through which the driving reins are passed (6) Terret https://www.collinsdictionary.com/dictionary/english/terret