Join military group, to a point (5)
I believe the answer is:
unite
'join' is the definition.
(I know that join can be written as unite)
'military group to a point' is the wordplay.
'military group' becomes 'unit' (group of soldiers).
'to a point' becomes 'e' (compass point).
'unit'+'e'='UNITE'
(Other definitions for unite that I've seen before include "Put together" , "fuse" , "Wed?" , "pool resources" , "Marry" .)