Clue: Look at a film with a theme that's controversial — as, say, a 23 11? (4,1,4,2,1,5)
Answer: LIKE A MOTH TO A FLAME
Explanation: Definition: as, say, a 23 11?
definition: as if fatally attracted to something – 23 11 being FATAL ATTRACTION 
anagram/"controversial" of (Look at a film + a theme)