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18d Taking time off, most learn to retrain as hospital worker (8) ?L?O?E?S
25a Caught like some doves (8) ?O???R?D
28a Ancient book of science and revolution (6) ???O?L
Any hints appreciated

25a Something a formal shirt maybe.

28a Ancient book may be the definition. Science = sc + a synonym for revolution.

18d subtraction anagram...mos(t) learn.
I think the definition should be plural.

Hope these hints weren't overly obvious.
:-)

Thanks busby
These are a big help