Military group solvers join together say (4)
I believe the answer is:
unit
'military group' is the definition.
(group of soldiers)
'solvers join together say' is the wordplay.
'solvers' becomes 'u' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'join together' becomes 'knit' (I've seen this before).
'say' indicates a 'sounds like' (homophone) clue.
'knit' sounds like 'nit'.
'u'+'nit'='UNIT'
Can you help me to learn more?
(Other definitions for unit that I've seen before include "Entity, system; component group" , "Entity making up part of a whole" , "Mexican maize pancake" , "Individual thing or group regarded as complete" , "Individual thing; one" .)