Bristle on barley (3)
I believe the answer is:
awn
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bristle on barley</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for awn that I've seen before include "Bristle on grass spikelet" , "Beard of cereal" , "Bristles" , "Bristle on cereal spike" , "Stiff bristle on grasses" .)