Long flowing hair (4)
I believe the answer is:
mane
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">long flowing hair</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>
(Other definitions for mane that I've seen before include "Neck hair of an animal" , "Animal's neck hair" , "Long thick hair" , "Lion or horse's 10 Across" , "(Lion's) hair on neck" .)