I gave this another go this morning, hoping coming to it afresh would help. It didn't. My wife said: 'You're obviously not enjoying it, why don't you do something else?' Sound advice.
I cheated to get the answers to a random few, which I still don't understand.
50d Had garden worker put up fences (5)
A: Owned.
47d Singer out of A&E – he's at home with us (6)
Briton.
54a Changing latest film in our name (2,3,4)
On the turn.
10d Heaven recalled in bible stories (7)
Nirvana.