Fuss about a US soldier's slow movement? (6)
I believe the answer is:
adagio
'slow movement' is the definition.
(slow musical movement)
'fuss about a us soldier's' is the wordplay.
'fuss' becomes 'ado' (synonyms).
'about' is an insertion indicator.
'us soldier' becomes 'GI' (GI can mean an American soldier).
'a'+'gi'='agi'
'ado' going around 'agi' is 'ADAGIO'.
(Other definitions for adagio that I've seen before include "' - - for Strings' (Barber)" , "Slow and graceful, musically" , "In slow time (music)" , "Slowly and gracefully, musically" , "Slow movement in musical work" .)