Plant flourishing as I write (8)
I believe the answer is:
wisteria
'plant' is the definition.
The answer is an example.
'flourishing as i write' is the wordplay.
'flourishing' is an anagram indicator (letters grow or flourish differently).
'as'+'i'+'write'='asiwrite'
'asiwrite' anagrammed gives 'WISTERIA'.
(Other definitions for wisteria that I've seen before include "As I write badly about the flowering vine" , "Vine with pendulous clusters of flowers" , "Climbing lilac-flowered shrub" , "I swear it is a flowering vine" , "I saw tire in this vine with the long flower clusters" .)