Heath-covered tract (4)
I believe the answer is:
moor
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">heath-covered tract</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 moor that I've seen before include "Open land - secure a boat - North African" , "Secure ship with cables" , "eg Ilkley, Othello" , "Heathery upland" , "Expanse of uncultivated upland" .)