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27a Large mammals eating duck, bloody little one, less than excited (5,2,5)
I have: ?O?E?/ ?? / T????
16d Myth is so very old, old actor beginning to slumber (9)
I have: V?W?L?E??
I can only think of VOWELLESS but this makes no sense.
17d Wonderful work ending for magician in land of huge, huge proportions? (8)
I have: ?A?T?S?? - FANTASIA?

16 Vowelless works - V/ery O/ld + Welles (old actor, orson) + S, beginning of/to Slumber. Vo welles s.

27 Bored to tears

O + Red + Tot in Bears

17 Fantasia

End of magician - N in Fat Asia

Many thanks malone and mamya for both the answers and the parsing.