Not even soldiers on time for remnant (7)
I believe the answer is:
oddment
'for remnant' is the definition.
(synonyms)
'not even soldiers on time' is the wordplay.
'not even' becomes 'odd' ('odd' is the opposite to 'even').
'soldiers' becomes 'men' (men can mean a group of soldiers).
'on' means one lot of letters go next to another.
'time' becomes 't' (abbreviation).
'odd'+'men'+'t'='ODDMENT'
(Other definitions for oddment that I've seen before include "a bit spare" , "Remnant" , "One of a broken set" , "Scrap" , "Curiosity, peculiarity" .)