Crossword Genius

Short, lively party without Irish thug (8)

Ross

I believe the answer is:

hooligan

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'thug' is the definition.
(I've seen this before)

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

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(Other definitions for hooligan that I've seen before include "Thug, ruffian" , "Ruffian, yob" , "A young ruffian" , "Ruffian, noisy troublemaker" , "Undesirable" .)

I've seen this clue in The Irish Times.
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