Crossword Genius

Semi-mobile gang (3)

Ross

I believe the answer is:

mob

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'gang' is the definition.
(I know that gang can be written as mob)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for mob that I've seen before include "An undisciplined gang of people" , "Kind of cap" , "Throng" , "Crime syndicate or disorderly crowd" , "press round" .)

I've seen this clue in the Evening Standard.
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