### Clue: SF writer acts like one with film that is withdrawn (6)
### Answer: ASIMOV 
 ### Explanation: Definition: SF writer
 AS(acts like) I(Roman numeral for "one") **plus**(with) "movie"(a film) **minus**(… withdrawn) "i.e."(abbrev. for "id est", Latin for that is).
Answer: Isaac, American author of science fiction as well as non-fictional science books.