Pastoral pipe (4)
I believe the answer is:
reed
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">pastoral pipe</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 reed that I've seen before include "It grows in water or marshy land" , "Blade of tall marsh grass" , "Vibrator in the mouthpiece of a wind instrument" , "Clarinet part; plant" , "Film director" .)