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CROSS, THEATER, DRAGON, BOOT, MASS, OLIVE, ROUND, AMERICA.
Assassin: TRAIN (directly in the center, by the way).
CROSS + MASS = "church"
Maybe "hellfire" can get CROSS, MASS, and DRAGON?
...blue is missing POLE as a "fence" word.
(gives "hellfire" clue)
"I barely see 1 let alone 3" - well that's encouraging
Wow, they are totally going off on the wrong direction here. Welp.
"Moreover I think our cluer knows I know they're Jewish and that I'd know the cross can lead to hell. So maybe that's right actually" - Really didn't put that much thought into it to be honest... but sure.