Pelargonium (8)
I believe the answer is:
geranium
'pelargonium' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for geranium that I've seen before include "Popular flower" , "Showy garden flower, often seen in window-boxes" , "I run game to get colourful flower for windowbox" , "Cranesbill plant" , "Herbaceous plant" .)