Flower arranging rich do (6)
I believe the answer is:
orchid
'flower' is the definition.
(orchid is a kind of flower)
'arranging rich do' is the wordplay.
'arranging' is an anagram indicator.
'rich'+'do'='richdo'
'richdo' is an anagram of 'ORCHID'.
(Other definitions for orchid that I've seen before include "Chord I play for the flower" , "Plant with showy flowers" , "Flowering plant with bee and lady varieties" , "Often prized flowering plant" , "Glamorous tropical flower" .)