間者 is read as かんじゃ (kanja) and means spy.
かんじゃ
kanja
まぢか
near
まがり
renting a room
まぐち
frontage
まじきり
partition between two rooms
まぢかい
near at hand
ちょうじゃ
chief of a post town
ぎょうしゃ
fellow trader
がくしゃ
learned person
さくしゃ
creator (of a work)
ししゃ
dead person
こうしゃ
the latter
ぜんしゃ
the former