Crossword Genius

Launch backhander (4)

Ross

I believe the answer is:

bung

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'launch' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

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(Other definitions for bung that I've seen before include "sweetener" , "Tip, bribe (sl.)" , "Bribe (slang)" , "Bribe - bottle stopper" , "illegal incentive" .)

I've seen this clue in The Guardian.
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