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45a unknown old couple stop and leave bottles hanging together in gardens for collection (10,4)
??????I??? / ????
33d fixed casting when second rate support system about to give out (6,7) ????I?? / ???????
49a Escape for hour at last, get to play ball (9)
Any help grateful

Robert, I do not have the crossword therefore the following is a long shot

33d could your L be wrong and the answer be SAFETY HARNESS?

49a Acquiesce?

zoological park
ballot rigging

thank you

Dandelion - can you explain acquiesce?
Thanks.

acquiesce = to agree = to play ball
acquire = to get .... instead of R (hour at last) substitute ESC(ape)