An officer met with a reverse, just for now (3,3)
I believe the answer is:
pro tem
'for now' is the definition.
(short for pro tempore, meaning for the time being)
'an officer met with a reverse' is the wordplay.
I cannot quite see how this works, but
an anagram of 'met' is 'tem' which is located in the answer.
The remaining letters 'pro' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'just' acts as a link.
Can you help me to learn more?
(Other definitions for pro tem that I've seen before include "Informally, for the time being" , "For the present" , "'For the time being (3,3)'" , "not indefinitely extended" , "For the time being, to the old Romans in short" .)