Garbo-like (5)
I believe the answer is:
alone
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">garbo-like</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for alone that I've seen before include "Singly" , "Without friends" , "Isolated from others" , "without partner?" , "On one's own" .)