Give up advantage and get moving (4-5)
I believe the answer is:
kick-start
'get moving' is the definition.
(I've seen this before)
'give up advantage' is the wordplay.
'give up' becomes 'kick' (kicking is a kind of giving up).
'advantage' becomes 'start' (start is a kind of advantage).
'kick'+'start'='KICK-START'
'and' acts as a link.
(Other definitions for kick-start that I've seen before include "Get something going" , "Activate suddenly" , "Provide an initial impetus" , "make a good beginning" , "Activate (business or motorbike!)" .)