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Please could someone help me with the last 2 remaining clues?

43 across - percussion instrument (7 letters)
Y ? R ? A ? A

53 across - naturally breaking down (13 letters)
B ? O ? M ? R ? D ? T ? E

Thanks in advance.

53a biodegradable
43a marimba

Thanks so much - had a couple of clues wrong - speciality instead of specialism and deter instead of debar.

Many thanks - really appreciate your help.