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Can't parse two, any help appreciated.
14d Certain about accepting old copy? Wrong. (9)
E-r-n-o-s
Erroneous? I can see the backward 'sure' from 'certain about' but not the rest.
18d Notice enclosed in church resolution (7)
C-d-n-e
Cadence?

Roneo is an old copying machine

Ad (notice). Enc- enclosed

Inside CE (church)

Thank you. Not heard of Roneo.