Crossword Genius

Lousy trio performing in a wanton manner (9)

Ross

I believe the answer is:

riotously

'in a wanton manner' is the definition.

'lousy trio performing' is the wordplay.
'performing' is an anagram indicator.
'lousy'+'trio'='lousytrio'
'lousytrio' anagrammed gives 'RIOTOUSLY'.

(Other definitions for riotously that I've seen before include "In wild and uncontrolled manner" , "profusely" .)

I've seen this clue in The Independent.
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