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Frontman and band get bullsh*t crowds (4)

Ross

I believe the answer is:

mobs

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'crowds' is the definition.
(I know this)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for mobs that I've seen before include "Unruly crowds" , "riotous assemblies" , "Disorderly crowds of people" .)

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