To make a quick getaway go by air (4,6)
I believe the answer is:
take flight
'to make' is the definition.
The definition and answer can be both to do with motion as well as being verbs in their base form.
Perhaps they are linked in a way I don't understand?
'a quick getaway go by air' is the wordplay.
'a quick getaway go' becomes 'take' (I am not sure about this - if you are sure you should believe this answer much more).
'by' means one lot of letters go next to another.
'air' becomes 'flight' (flight is a kind of air).
'take'+'flight'='TAKE FLIGHT'
Can you help me to learn more?
(Another definition for take flight that I've seen is " get away".)