Slowly, a soldier captures lawman with ring (6)
I believe the answer is:
adagio
'slowly' is the definition.
(I've seen this before)
'a soldier captures lawman with ring' is the wordplay.
'soldier' becomes 'gi' (GI can mean a US soldier).
'captures' indicates putting letters inside.
'lawman' becomes 'da'.
'with' says to put letters next to each other.
'ring' becomes 'o'.
'a'+'gi'='agi'
'agi' placed around 'da' is 'adagi'.
'adagi'+'o'='ADAGIO'
(Other definitions for adagio that I've seen before include "Slow musical passage" , "In slow time (mus.)" , "Musical composition to be played slowly and gracefully" , "Slowly, from a conductor" , "Slow and graceful, musically" .)