Pedigree (4)
(Other definitions for tree that I've seen before include "Root-and-branch plant?" , "Tall perennial plant" , "Source of wood" , "Plant with bark" , "Large shrub; family line" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">pedigree</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for line that I've seen before include "column" , "job" , "Long mark; direction" , "Wrinkle; row" , "Ancestry" .)