Signs of injury to blacklegs? (5)

I believe the answer is:

scabs

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'blacklegs?' is the definition.
('scab' can be a synonym of 'blackleg')

I don't understand the remainder of the clue.

(Other definitions for scabs that I've seen before include "They continue to work" , "Wound crusts" , "Blacklegs, strikebreakers" .)

I've seen this clue in the Evening Standard.

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