The roguishness of old soldiers? (7)
I believe the answer is:
archery
This could 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 an association 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" .)