Withdrawal method? (4,8)
I believe the answer is:
exit strategy
'withdrawal method?' is the definition.
I don't know anything about this answer so I can't tell whether this works.
'withdrawal method?' is the wordplay.
'withdrawal' becomes 'exit' (I've seen this before).
'method?' becomes 'strategy' (I can't explain this - if you can you should believe this answer much more).
'exit'+'strategy'='EXIT STRATEGY'
(Other definitions for exit strategy that I've seen before include "Plan for future disengagement from a commitment" , "Withdrawal plan" , "Plan to go" , "Plan to get out!" .)