Organ grinder's assistant stashes detailed picture for soldiers (7)
I believe the answer is:
samurai
'organ' is the definition.
The answer and definition can be both groups as well as being singular nouns.
Perhaps there's a link between them I don't understand?
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for samurai that I've seen before include "military type" , "Military figures" , "Japanese militarist" , "Member of the military caste in feudal Japan" , "Member of Japanese warrior caste" .)