Sign made by soldier at Agincourt? (6)
I believe the answer is:
archer
I believe this clue is a double definition.
'sign' is the first definition.
(I know that Archer is a sign)
'soldier at agincourt?' is the second definition.
(bows were used at the Battle of Agincourt)
'made by' acts as a link.
(Other definitions for archer that I've seen before include "Arrows one sends" , "Jeffrey --, writer" , "Bowman - popular author" , "One uses bows and arrows" , "Small insect" .)