Crossword Genius

Picket line crosser (4)

Ross

I believe the answer is:

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">picket line crosser</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(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 Universal, the USA Today, the Penny Press, The Wall Street Journal and the LA Times.
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