Greet, as a soldier (6)
I believe the answer is:
salute
'greet as a soldier' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for salute that I've seen before include "A greeting, often military" , "Gesture of greeting" , "Mark" , "Acknowledge (superior)" , "Hail with a gesture" .)