Heedful, observant (9)
I believe the answer is:
attentive
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">heedful</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >'<span class="explanation-format__original">observant</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ ></span>
(Other definitions for attentive that I've seen before include "Listening closely" , "Dutiful" , "Alert; observant" , "Showing courtesy to another, or alert" , "Taking notice" .)