Recognise, tell apart (7)
I believe the answer is:
discern
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">recognise</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >'<span class="explanation-format__original">tell apart</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for discern that I've seen before include "Espy" , "Recognise, find out" , "Perceive - distinguish" , "spot" , "Notice" .)