Wild clematis (3,4,5)
I believe the answer is:
old mans beard
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">wild clematis</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 old mans beard that I've seen before include "in which eight birds nested according to Lear" , "Wild clematis" , "Trailing plant" , "growing on craggy face, perhaps" , "that grows up fast" .)