Go on - escape! (7)
I believe the answer is:
getaway
'go on escape' is the definition.
'getaway' can be an answer for 'escape' (getaway is a kind of escape). I am unsure of the 'go on' bit.
'go on escape' is the wordplay.
'go' becomes 'away' (I can't explain this - if you can you should give a lot more credence to this answer).
'on' means one lot of letters go next to another.
'escape' becomes 'get' (I've seen this before).
'away' put after 'get' is 'GETAWAY'.
Can you help me to learn more?
(Other definitions for getaway that I've seen before include "Escape" , "flight" .)