1d best learner of dog trials breaking out[4,5] ?t?r,?u?i?
8a flick knife user who won't agree [9] ?e?u?e???
11a town charter broadcast by roman governor [8] t?t?a???
6d mace when top of cork's found in drink [5]
13d battle with airline over a chief, say[2,7] ?l,?l???I?
15d while fighting sluggishness [8] I?a???o?
20a bury cryptic note given to doctor [6] e?????
thank you