Bother checking a soldier's movement (6)
I believe the answer is:
adagio
'movement' is the definition.
(type of musical movement)
'bother checking a soldier's' is the wordplay.
'bother' becomes 'ado' (I've seen this before).
'checking' is an insertion indicator (check can mean to control or arrest).
'soldier' becomes 'gi' (government issue or general issue).
'a'+'gi'='agi'
'ado' placed around 'agi' is 'ADAGIO'.
(Other definitions for adagio that I've seen before include "Leisurely, musically speaking" , "Slowly and graceful, in music" , "Movement in slow time" , "In slow time (mus.)" , "' - - for Strings' (Barber)" .)