Crossword Genius

Attack on way to introduce comedian (9)

Ross

I believe the answer is:

onslaught

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'attack' is the definition.
(synonyms)

I cannot understand how the remainder of the clue works.

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(Other definitions for onslaught that I've seen before include "Heavy attack" , "Hunt goals (anag) - offensive" , "Destructive attack" , "offensive action" , "Sudden and severe onset of trouble" .)

I've seen this clue in The Telegraph.
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