Fellow in committee with computer software for soldiers (9)
I believe the answer is:
commandos
'fellow in committee with computer' is the definition.
I can't judge whether this definition defines the answer.
'software for soldiers' is the wordplay.
'software' becomes 'command' (command is a kind of software).
'for soldiers' becomes 'os' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'command'+'os'='COMMANDOS'
Can you help me to learn more?
(Other definitions for commandos that I've seen before include "Soldiers trained for raids" , "special service troops" .)