Leaders of troops filling suitable job (11)
I believe the answer is:
appointment
'job' is the definition.
(I know that appointment is a type of job)
'leaders of troops filling suitable' is the wordplay.
'leaders of troops' becomes 'pointmen' (I am not sure about this - if you are sure you should believe this answer much more).
'filling' means one lot of letters goes inside another.
'suitable' becomes 'apt' (apt means appropriate or fitting).
'pointmen' put inside 'apt' is 'APPOINTMENT'.
Can you help me to learn more?
(Other definitions for appointment that I've seen before include "Date" , "Meeting" , "Job, position" , "German city" , "Engagement" .)