What's at end of tunnel after Black Plague? (6)

I believe the answer is:

blight

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'plague?' is the definition.
('blight' can be a synonym of 'plague')

I can't explain the rest of the clue.

(Other definitions for blight that I've seen before include "Plant disease -- calamity" , "Fungal plant disease" , "Setback" , "Shrivelling disease" , "Disease of plants etc" .)

I've seen this clue in The Sun.

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