The flower of wit, really oddly (5,4)
I believe the answer is:
water lily
'the flower' is the definition.
(thesaurus)
'wit really oddly' is the wordplay.
'oddly' indicates anagramming the letters (letters in an odd order).
'wit'+'really'='witreally'
'witreally' with letters rearranged gives 'WATER-LILY'.
'of' acts as a link.
(Other definitions for water lily that I've seen before include "Pond plant" , "Plant painted many times by Monet" , "Aquatic plant with showy flowers" .)