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Thanks for the help with the above so far ,asking again please,
19Dn This lung opens for the benefit of all earthy life,(8) S?????h?
21Ac Powerful substance might be useful without us around, (4) ??e?

Sunlight? (anag)

Useful - us = eful - around = fuel?

Thanks, I can't make head nor tail of some of the clues most of the time , appreciate all the help, cheers