Soldiers and conflict sound worthwhile (9)
I believe the answer is:
rewarding
'worthwhile' is the definition.
(I've seen this before)
'soldiers and conflict sound' is the wordplay.
'soldiers' becomes 're' (Royal Engineers).
'and' is a charade indicator (letters next to each other).
'conflict' becomes 'war' (war is a kind of conflict).
'sound' becomes 'ding' (I've seen this before).
're'+'war'+'ding'='REWARDING'
(Other definitions for rewarding that I've seen before include "worthwhile" , "Satisfying, well worth doing" , "Providing personal satisfaction" , "profitable" , "Well worth doing for its own sake" .)