Tacky band releasing tape initially finish fifty to flog (4,3)

I believe the answer is:

sell off

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'flog' is the definition.
(I know that sell off is a more specific form of the action flog)

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

(Other definitions for sell off that I've seen before include "Dispose of for money" , "cheap sale" , "Sale to dispose of assets" .)

I've seen this clue in The Independent.

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