Steer clear of military command (4)
I believe the answer is:
shun
I believe this is a double definition.
'steer clear' is the first definition.
'military command' is the second definition.
(shun is a common military parade command)
'of' is the link.
(Other definitions for shun that I've seen before include "rigid standing order?" , "Send to Coventry" , "Persistently reject" , "Cold-shoulder" , "Steer clear of" .)