Such a movement with added energy could be altogether different (9)
I believe the answer is:
larghetto
'such a movement' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
(Other definitions for larghetto that I've seen before include "Slowish" , "movement" , "rather slowly" , "Rather slow" , "In a fairly slow tempo (>music)" .)