One way to surrender or withdraw (6)
I believe the answer is:
secede
'withdraw' is the definition.
(I've seen this before)
'one way to surrender' is the wordplay.
'one way' becomes 'se' (I can't justify this - if you can you should give a lot more credence to this answer).
'to surrender' becomes 'cede' ('cede' can be a synonym of 'surrender').
'se'+'cede'='SECEDE'
'or' acts as a link.
Can you help me to learn more?
(Other definitions for secede that I've seen before include "Withdraw from, say organisation" , "'Withdraw formally, from a political body perhaps (6)'" , "'Withdraw, break away (6)'" , "Make a formal withdrawal" , "Withdraw (politically)" .)