Answer article describing unknown meadow flower (6)
I believe the answer is:
azalea
'flower' is the definition.
(I've seen this before)
'answer article describing unknown meadow' is the wordplay.
'answer' becomes 'a' (abbreviation eg in Q and A).
'article' becomes 'a' (the indefinite article in English).
'describing' means one lot of letters goes inside another (describe can mean to form the outline of).
'unknown' becomes 'z' (algebra).
'meadow' becomes 'lea' (a lea is a grassy area).
'a'+'a'='aa'
'aa' placed around 'z' is 'aza'.
'aza'+'lea'='AZALEA'
(Other definitions for azalea that I've seen before include "Garden shrub" , "Colourful shrub related to rhododendron" , "Shrub with brightly coloured flowers" , "Acid-loving plant" , "Flowering shrub akin to rhododendron" .)