Times 25,299

[Bogtrotter]

Struggling to finish. 21a A note put out describing perhaps his scheme as crazy: o? a???h?? ??n?? - On another planet? 18a Shady area where assistant introduces additive, one European banned: ?????b?a. Hope these will get me back on track!

[shooty]

http://www.theanswerb.../Question1180840.html

[bibblebub]

21a) on another planet = anagram of 'a note' outside 'not her plan'

18a) penumbra = P.A. outside e-numb(e)r

[sandyRoe]

penumbra?
on another planet looks ok

[Lie-in King]

21a On another planet (crazy) - anag 'a note' (describing; outside) 'not her plan' (perhaps his scheme)

18a Penumbra (shady area) - 'e numb(E)r' (additive, one E[uropean] banned, in) 'PA'