Military gesture of respect (6)
I believe the answer is:
salute
'military gesture of respect' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for salute that I've seen before include "Hail with a gesture" , "Greet with a sign" , "Military gesture of respect" , "Greet in a friendly way" , "Pay tribute to; greet" .)