Having a thermal exhaust port lead straight to the reactor of your Death Star, e.g (4)

I believe the answer is:

flaw

(Other definitions for flaw that I've seen before include "Imperfection or blemish" , "Fault, blemish" , "Error in theory or plan" , "Defect, imperfection" , "(Make) defect(ive)" .)

I've seen this clue in The New York Times.

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