Astronaut Buzz (6)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">astronaut buzz</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for aldrin that I've seen before include "'Buzz' -, US astronaut" , "Buzz, second man on moon" , "Buzz . . . . . ., moonwalker" .)