19 d 'would this predator need the flap from a giant's door? ?i? ??T
24a 'Poured. (Can't indeed!) d???n??D
25a 'Shoe of the dreaming spires' ?X?O?D . Oxford would fit, but why?
19d Big cat
24a De-cant-ed
25a Oxford - a shoe & Oxford is known as the "city of dreaming spires", a term coined by poet Matthew Arnold in reference to the harmonious architecture of Oxford's university buildings (from Wikipedia)