With onion cooked anise only (9)
I believe the answer is:
lyonnaise
'with onion cooked anise only' is the definition.
I can't judge whether this definition defines the answer.
'cooked anise only' is the wordplay.
'cooked' indicates anagramming the letters.
'anise'+'only'='aniseonly'
'aniseonly' is an anagram of 'LYONNAISE'.
Can you help me to learn more?
(Other definitions for lyonnaise that I've seen before include "cooked in a way to make you cry?" , "Served with onions" , "(Of potatoes) cooked with onions in a wine sauce" , "cooking with onions" .)