Preserve queen with a lead compound (9)
I believe the answer is:
marmalade
'preserve' is the definition.
(I know that marmalade is a type of preserve)
'queen with a lead compound' is the wordplay.
'queen with' becomes 'marm' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'compound' indicates anagramming the letters.
'lead' with letters rearranged gives 'lade'.
'marm'+'a'+'lade'='MARMALADE'
Can you help me to learn more?
(Other definitions for marmalade that I've seen before include "Preserve made with citrus fruits" , "Breakfast preserve" , "group?" , "Sweet food" , "Orange preserve" .)