Iron preparation goes with rouge (4)
I believe the answer is:
noir
'with rouge' is the definition.
I don't know anything about this answer so I cannot tell whether this works.
'iron preparation' is the wordplay.
'preparation' indicates an anagram.
'iron' with letters rearranged gives 'NOIR'.
'goes' acts as a link.
Can you help me to learn more?
(Other definitions for noir that I've seen before include "cinematic style" , "(Of film or fiction) with bleak settings and cynical characters" , "Dark in France, like brooding films of 40s and 50s" , "type of film" , "film genre" .)