Girls gee you up flagrantly (11)
I believe the answer is:
egregiously
'flagrantly' is the definition.
(thesaurus)
'girls gee you up' is the wordplay.
'up' indicates an anagram.
'girls'+'gee'+'you'='girlsgeeyou'
'girlsgeeyou' anagrammed gives 'EGREGIOUSLY'.
I've seen this clue in The Times.
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