He is, in short, a martial figure (6)
I believe the answer is:
edward
This clue might be a double definition.
'he' is the first definition.
(I've seen this before)
'short a martial figure' is the second definition.
The definition suggests a singular noun which matches the answer.
'is in' is the link.
Can you help me to learn more?
(Other definitions for edward that I've seen before include "Former King" , "The eighth one abdicated" , "-- Lear, poet" , "The Queen's youngest son" , "Lear, Elgar or Fox" .)