Not fully closed (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">not fully closed</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 ajar that I've seen before include "Partly open" , "Half open" , "A little bit open, like door" , "It's nearly open" , "not entirely open" .)