Musically, a slow movement (6)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
adagio
(Other definitions for adagio that I've seen before include "In slow time (mus.)" , "Musical composition to be played slowly and gracefully" , "Leisurely, musically speaking" , "In slow time (music)" , "In music, leisurely" .)