Lightly cooked (4)
I believe the answer is:
rare
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">lightly cooked</span>' is the definition.<br/ ><span class="explanation-format__explanation">(as in a rare steak)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for rare that I've seen before include "may be bloody" , "Might steak be" , "Not well done!" , "Seldom seen or met" , "Not found often" .)