MOD man can’t put off camp officer (10)
I believe the answer is:
commandant
'camp officer' is the definition.
'commandant' can be an answer for 'officer' (commandant is a kind of officer). I am not sure about the 'camp' bit.
'mod man can't put off' is the wordplay.
'put off' is an anagram indicator.
'mod'+'man'+'cant'='modmancant'
'modmancant' with letters rearranged gives 'COMMANDANT'.
Can you help me to learn more?
(Other definitions for commandant that I've seen before include "one who takes charge" , "Officer in charge of a place or group of troops" , "Military officer in charge of a place" .)