Lemon neckwear detailed by fashion’s innovative leaders (6)
I believe the answer is:
fiasco
'lemon' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for fiasco that I've seen before include "Abject failure" , "Calamity" , "Utter and ridiculous failure" , "Sudden and complete collapse" , "An absolute mess, what a farce" .)