You may need to do it if planning a getaway? (4,6)
I believe the answer is:
take flight
'you may need to do it' is the definition.
I can't judge whether this defines the answer.
'planning a getaway?' is the wordplay.
'planning' becomes 'take' (I am not sure about this - if you are sure you should believe this answer much more).
'a getaway?' becomes 'flight' (getaway is a kind of flight).
'take'+'flight'='TAKE FLIGHT'
'if' acts as a link.
Can you help me to learn more?
(Another definition for take flight that I've seen is " get away".)