Crossword Genius

Picket line crosser (4)

Ross

I believe the answer is:

'picket line crosser' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for scab that I've seen before include "Dried crust on sore" , "cause of itch?" , "Non-striker" , "Blackleg, strike-breaker" , "Dried surface of wound" .)

I've seen this clue in the Penny Press, the LA Times and The Wall Street Journal.
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