Actor McGregor (4)
I believe the answer is:
ewan
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">actor mcgregor</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 ewan that I've seen before include "-- McGregor, actor" , "name for Scottish lad" .)