20A - mags erring, perhaps, taking illustrations from other publications (10) I have ???N?????m
28A - reliable restorer of old manuscripts (9) I have S?L?O???E
7D - Ulysses' men who forgot to avoid the fruit course (9) I have L?????A?? - something to do with lotos-eaters ?
13D - a mere puppet of Stravinsky (10) I have ?E?????H??- Petroushka (normal spelling Petrushka)
OK, thanks for answers given - but more
12A - silver article on pipe broken in spring ((8) I have ?G?N?P??
22A - use a star to make father of stars (8) I have A?T?A?U? - presumably anagram of 'use a star' but I don't get it
18D - such a device may have a bearing (8) I have ?E???D?C