@maizey,
Thank you maizey. Always remember, clues, magazine and puzzle and the answers will keep flowing in, if not from me, from some of the other clever cruciverbalists here.
54a = SAMPLE
62a = SWALLOWS
55d = AILMENT
To help you a little more.
49d = EXPLORATION
65a = GRIEVANCES
they will fit in with your 3 queries. Good luck.