5d - Ransack - r?p?e - thought it was "rifle" but 9a clue is Monastry and I have ??i?r? so assume answer is "priory" - this means that 3rd letter in 5d is "p"!...
Going round in circles here! 9a - Decided in advance - 3, 3, 5 - thought it was "cut and dried" but doesn't fit in with 1d - Shopkeeper (answer seller) so 9a first word starts with "l" from seller....
Going round in circles here! 54a - person in custody (detainee); 54d public protest (demo); 55d a football side (team) 39d the rank and file (grass roots) - 60a - at a snail's pace - assuming that...