Brook, burn (6)
I believe the answer is:
stream
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">brook</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">burn</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(burn is a Scottish dialect word for a stream)</span><br/ ><br/ ></span>
(Other definitions for stream that I've seen before include "Master (anag) - current" , "pupils pour out" , "Moving water" , "Rill, brook" , "schoolchildren grouped together" .)