Ask for address (4,2)
I believe the answer is:
turn to
'address' is the definition.
(I know that address can be written as turn to)
'ask for' is the wordplay.
'ask' becomes 'turn' (I can't justify this - if you can you should believe this answer much more).
'for' becomes 'to' (eg both can mean 'in the opinion of').
'turn'+'to'='TURN TO'
Can you help me to learn more?
(Other definitions for turn to that I've seen before include "Result in" , "Address" , "set about a task" , "Fall back on" , "Consult with" .)