Crossword Genius

Encrustation on sore (4)

Ross

I believe the answer is:

scab

(Other definitions for scab that I've seen before include "Crust formed over wound" , "cause of itch?" , "Strike-breaker; skin disease in animals" , "Someone who works during a strike" , "he refuses to come out" .)

I've seen this clue in the Sydney Morning Herald.
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