Code cracked by Romeo reveals scheme (5)
I believe the answer is:
decor
'scheme' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'code cracked by romeo' is the wordplay.
'cracked' is an anagram indicator.
'by' means one lot of letters go next to another.
'romeo' becomes 'r' (phonetic alphabet: alpha, bravo, charlie etc.).
'code' with letters rearranged gives 'deco'.
'deco'+'r'='DECOR'
'reveals' acts as a link.
Can you help me to learn more?
(Other definitions for decor that I've seen before include "Interior colour scheme and furnishing" , "ornament" , "Scheme of interior furnishings" , "furnishings required" , "Internal ornamentation" .)