Hibiscus originally captured by artist, a flowering plant (6)
I believe the answer is:
dahlia
'flowering plant' is the definition.
(dahlia is a kind of flowering plant)
'hibiscus originally captured by artist a' is the wordplay.
'originally' says to take the initial letters.
'captured by' is an insertion indicator.
'artist' becomes 'dali' (Salvador Dali).
The initial letter of 'hibiscus' is 'h'.
'h' going into 'dali' is 'dahli'.
'dahli'+'a'='DAHLIA'
(Other definitions for dahlia that I've seen before include "Showy, big-headed autumn flower" , "Composite" , "conspicuous bloomer" , "Flower with pompom variety" , "Brightly coloured garden flower with tuberous roots" .)