Circular grassland left rough (7)
I believe the answer is:
leaflet
'circular' is the definition.
(I know that circular can be written as leaflet)
'grassland left rough' is the wordplay.
'grassland' becomes 'lea' (lea is a kind of grassland).
'rough' indicates an anagram (a rough or broken ordering of the letters).
'left' with letters rearranged gives 'flet'.
'lea'+'flet'='LEAFLET'
(Other definitions for leaflet that I've seen before include "Sheet of paper giving information" , "very little greenery" , "Handout sheet" , "Small information sheet" , "Distribute small circulars" .)