Green span (3)

I believe the answer is:
lea
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">green span</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for lea that I've seen before include "Land growing grass" , "Open country" , "Open area of grassy or arable land" , "pastoral setting" , "Meadowland" .)