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11a Radium grows inert, being responsible for composition of air (10)S?N?????E?

25a Rigid, somehow I breathe after swallowing large ball (9) ??????B?E

20d Early sound recorder ones restored (6) ?D????
- Edison maybe?

11a songwriter(anag - haven't worked out why Radium yet)

I have Edison - (di as added letters)

11a Radium grows inert, being responsible for composition of air - Songwriter
Rigid, somehow I breathe after swallowing large ball- Dirigible

Thank you trevor & AB

11a r(adi)um

thanks ixion,
clever that!