Renounce, when you surrender (4,2)
I believe the answer is:
give up
This might be a double definition.
'renounce' is the first definition.
(I know that renounce can be written as give up)
'you surrender' is the second definition.
'give up' can be an answer for 'surrender' (I've seen this before). I'm not sure about the 'you' bit.
'when' acts as a link.
Can you help me to learn more?
(Other definitions for give up that I've seen before include "Throw in the towel" , "Cease trying" , "Surrender informally, cease to try" , "Cede, forego" , "Renounce or yield" .)