A clear field (5)
This clue is a double definition.
'a clear' is the first definition.
(I've seen this before)
'field' is the second definition.
(synonyms)
(Other definitions for plain that I've seen before include "Simple - flatland" , "Straightforward" , "lament" , "Undecorated; clear" , "Clear, candid" .)
'field?' is the definition.
(lea can mean a meadow or field of grass)
'a clear' is the wordplay.
'LEA' is hidden within the letters.
However, I am uncertain how this is indicated.
Can you help me to learn more?
(Other definitions for lea that I've seen before include "Land growing grass" , "grazing area" , "authority for teachers" , "Open pasture" , "Open area of grassy or arable land" .)