Military men seeking the future not against one ministerial appointment (10)
I believe the answer is:
ordination
'appointment' is the definition.
(I know that ordination is a type of appointment)
'military men seeking the future not against one ministerial' is the wordplay.
I cannot really understand how this works, but
'men' could be 'or' (military abbreviation for Other Ranks) and 'or' is present in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is present in the answer.
'not' could be 'o' (I've seen this in other clues) and 'o' is found in the answer.
'one' could be 'i' (Roman numeral) and 'i' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for ordination that I've seen before include "Solemn moment for a Christian" , "Conferral of holy orders" , "church ceremony" , "Admission to holy orders" , "admission to ministry" .)