Releases legs to move (4,2)
I believe the answer is:
lets go
'releases' is the definition.
('let go' can be a synonym of 'release')
'legs to move' is the wordplay.
'move' indicates anagramming the letters.
'legs'+'to'='legsto'
'legsto' with letters rearranged gives 'LETS GO'.
(Other definitions for lets go that I've seen before include "Come on then, we're off!" , "fires" , "Order to leave" , "Liberates" , "Releases from one's grip" .)