Barley bristle (3)
I believe the answer is:
awn
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">barley bristle</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for awn that I've seen before include "Grass "beard"" , "Bristle on grass spikelet" , "Bristly head of barley sheath, quite wan" , "Beard growing from an ear of barley or rye" , "Bristly growth" .)