Musicians reportedly purloin, getting prohibited (5,4)

I believe the answer is:

steel band

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'musicians' is the definition.
(group of musicians)

I cannot understand how the rest of the clue works.

(Other definitions for steel band that I've seen before include "Caribbean ensemble" , "(Players of) improvised drums" , "Musicians playing oil drums" , "drummers" , "Team of beaters" .)

I've seen this clue in The Daily Express.

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