The roguishness of old soldiers? (7)
I believe the answer is:
archery
This might be a double definition.
'the roguishness' is the first definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'of old soldiers?' is the second definition.
The definition suggests a singular noun which matches the answer.
Can you help me to learn more?
(Other definitions for archery that I've seen before include "Bowmanship" , "Target sport - Olympic event in from 1900-08, in 1920 and since 1972" , "Sport of the bowman" , "The sport of shooting arrows with a bow" , "Shooting with bows and arrows" .)