Preparing for war, bring up male soldiers in appropriate technology (10)
I believe the answer is:
rearmament
'preparing for war' is the definition.
I can't judge whether this defines the answer.
'bring up male soldiers in appropriate technology' is the wordplay.
'bring up' becomes 'rear' (as in rearing children).
'male' becomes 'm' (common abbreviation).
'soldiers in appropriate technology' becomes 'ament' (I can't explain this - if you can you should believe this answer much more).
'rear'+'m'+'ament'='REARMAMENT'
Can you help me to learn more?
(Other definitions for rearmament that I've seen before include "prepare for war again?" , "preparing again for fight" , "Process of preparing for war again" .)