Showy shrub (6)
'showy shrub' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for azalea that I've seen before include "Ericaceous plant" , "Shrub with showy flowers" , "Garden shrub" , "Shrub resembling a small rhododendron" , "Rhododendron-type shrub" .)
(Other definitions for rhododendron that I've seen before include "Large shrub with evergreen leaves" , "Trumpet-shaped flower" , "Shrub with large flower clusters" , "Plant" , "Common shrub" .)