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4 down: First rate letter with second half turning strange (5) A?I?N I think it's alien, but don't understand the wordplay.
17 across: Symbol one moves in a bit (4) ?C?N again I think it's icon, but would like to know how the wordplay works.
24 down: Special excitement in sci-fi theme (5) S?A?E is it space and if so why?
Thanks in advance

17 a Bit is a US coin , move the 'i' (one) to the front

Thank you mamya

24 S is Special and Pace is excitement.

Hi, mjk,
For 4d. First-rate - A......letter - line.....second half turning - lien.....alien - strange.

Thanks for the explanation al_issner