Time when soldiers will get involved in test (6)
I believe the answer is:
moment
'time' is the definition.
(I have seen 'Short time ' mean 'moment' so perhaps 'time' could also mean 'moment')
'involved in test' is the wordplay.
'involved' becomes 'men' (I can't explain this - if you can you should give a lot more credence to this answer).
'in' is an insertion indicator.
'test' becomes 'mot'.
'men' inserted inside 'mot' is 'MOMENT'.
'when soldiers will get' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for moment that I've seen before include "Jiffy" , "tick" , "Instant - importance" , "Brief second" , "Occasion" .)