Wine, fruit and more mature lobster egg (10)
I believe the answer is:
elderberry
'wine fruit' is the definition.
'elderberry' can be an answer for 'fruit' (elderberry is a kind of fruit). I am unsure of the 'wine' bit.
'more mature lobster egg' is the wordplay.
'more mature' becomes 'elder' (older or more mature).
'lobster egg' becomes 'berry' (I can't explain this - if you can you should believe this answer much more).
'elder'+'berry'='ELDERBERRY'
'and' is the link.
Can you help me to learn more?
(Other definitions for elderberry that I've seen before include "Fruit used for cordial" , "Tree fruit used for wine" , "Wine or jelly can be made from this" , "Fruit used for home-made wine" , "A blue-black fruit" .)