White hair shaved on top (4)
I believe the answer is:
hock
'white' is the definition.
(type of white wine)
'hair shaved on top' is the wordplay.
'hair' becomes 'locks' (locks can mean hair).
'shaved' says to take the centre.
'on' says to put letters next to each other.
'top' becomes 'h' (I can't justify this - if you can you should believe this answer much more).
The central letters of 'locks' are 'ock'.
'ock' after 'h' is 'HOCK'.
Can you help me to learn more?
(Other definitions for hock that I've seen before include "White Rhine wine" , "Rhine wine -- horse joint" , "German white wine from Rhineland" , "Deposit with a pawnbroker" , "Animal joint - German white wine" .)