Warrant to leave the army? (7)
I believe the answer is:
deserve
'warrant' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for deserve that I've seen before include "Be worth" , "Merit, earn" , "Be entitled to" , "Severed (anag)" , "Merit (something)" .)