10a understood about blocking wily suberfuge to send down student (9)
r?s?i?a?e
18d judge arrives carrying snack (7) ??b????
25a frilly thing, clean item of bedwear (10) night?????
24a play patience (9) ????r???e
21d ring in private (5) i???r
19d mor than one buckler, maybe, is held awkwardly on set, at first (7) s?i????