a stinker of a puzzle, and although I have all the clued lights I'm stumped on two pairs of synonyms:
12a/36a: re?r?a?/?o?n?er and 3d/30d: ?o?ate/rec?i?
I just can't make sense of the words that fit these patterns,
Jazzgirl, thanks for that. I wondered about the synonyms, pairs stuff but I didn't have the puzzle to hand - and couldn't remember the exact wording in the preamble.
I didn't have any problem linking the words via back/backing or turn - all close enough for the common theme and common treatment, I think. For me, just a symmetrical arrangement of unlinked words is harder to justify.