Astronomical distance (6)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">astronomical distance</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 parsec that I've seen before include "Immense unit of distance" , "Unit of astronomical length" , "three and a quarter twenty sevens [LIGHT YEARS]" , "nineteen million million miles" , "Three+ light-years" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">astronomical distance</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>