Quite sour converts like Reform rosettes (9)
I believe the answer is:
turquoise
'reform rosettes' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'quite sour converts' is the wordplay.
'converts' indicates an anagram.
'quite'+'sour'='quitesour'
'quitesour' anagrammed gives 'TURQUOISE'.
'like' acts as a link.
Can you help me to learn more?
(Other definitions for turquoise that I've seen before include "not quite green" , "Greenish-blue colour" , "Sort of blue" , "Aquamarine colour" , "Birthstone for December" .)