Slow movement (6)
'slow movement' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for largo that I've seen before include "moving slowly" , "Slow passage" , "Musically in slow tempo and dignified style" , "Florida key: musical slow movement" , "Musical piece" .)
'slow movement' is the definition.
(slow musical movement)
This is the entire clue.
(Other definitions for adagio that I've seen before include "Leisurely tempo" , "Slow and graceful, musically" , "In slow time (music)" , "Slow movement in musical work" , "Slow movement (music)" .)