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Boundlessly dire dregs, dull, dark and disorderly (9)

Ross

I believe the answer is:

irregular

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'disorderly' is the definition.
(thesaurus)

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(Other definitions for irregular that I've seen before include "Erratic" , "Rough - guerrilla" , "Disorderly, uneven" , "unlike full-time soldiers" , "one of Holmes's Baker Street urchins" .)

I've seen this clue in The Telegraph.
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