Gallant rival upset in style (9)

I believe the answer is:

chivalric

'gallant' is the definition.
(thesaurus)

'rival upset in style' is the wordplay.
'upset' indicates anagramming the letters.
'in' is an insertion indicator.
'style' becomes 'chic' (chic can mean elegance or style).
'rival' is an anagram of 'valri'.
'valri' put into 'chic' is 'CHIVALRIC'.

(Another definition for chivalric that I've seen is " bold".)

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