Grassy expanse (7)
(Other definitions for prairie that I've seen before include "Tract of (US) grassland" , "Treeless grassy plain, in the old West perhaps" , "Broad rolling tract of land in the US" , "Cowboy song: ` `Bury me not on the lone .......' '" , "this oyster produces an egg" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">grassy expanse</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for lea that I've seen before include "River flowing through London" , "authority for teachers" , "pastoral setting" , "Open arable land (poet.)" , "Field" .)
(Other definitions for field that I've seen before include "See 20" , "Crop land; catch (ball)" , "Area of knowledge, for game" , "Enclosed piece of land or area of endeavour" , "Branch of knowledge; meadow" .)