Very grateful for all help with these clues please.
27ac: “Character from 25 perhaps a long way from base? (3).”
37dn: “Exposed to solar radiation, hundreds suffering must get enclosed inside (3-8).”
45ac: “Ancient ‘as allotted time cut shot (7).”
25a Phi (Gr. letter, ref 25d) - pH scale from 0 (acid) > 14 (base), so 'pH1' is a long way from base 37d Sun-drenched - 'enc(losed)' (in) anag 'hundreds' 45a (h)Olds-ter(m) (I think the clue should read "...cut short"
25a Phi (Gr. letter, ref 25d) - pH scale from 0 (acid) > 14 (base), so 'pH1' is a long way from base
37d Sun-drenched - 'enc(losed)' (in) anag 'hundreds'
45a (h)Olds-ter(m) (I think the clue should read "...cut short"