Fellows to subdue troops (9)
I believe the answer is:
gentlemen
'fellows' is the definition.
(I've seen this before)
'subdue troops' is the wordplay.
'subdue' becomes 'gentle' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'troops' becomes 'men' (both can mean soldiers).
'gentle'+'men'='GENTLEMEN'
'to' is the link.
Can you help me to learn more?
(Other definitions for gentlemen that I've seen before include "Males of refinement" , "fellows held to be considerate?" , "of high social standing?" , "Smugglers" , "Convenience" .)