Tall plant (9)
(Other definitions for hollyhock that I've seen before include "Plant with stout, hairy stems and spiky flowers" , "A bloomer" , "Christmas decoration" , "Tall country garden flower" , "blooming great" .)
'tall plant' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for sunflower that I've seen before include "Plant's" , "seen in Van Gogh's art" , "Source of oil" , "Tall plant" , "nickname of US State" .)