Large stream (5)
I believe the answer is:
river
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">large stream</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 river that I've seen before include "Eg, Severn" , "Slow-cooked meat dish" , "Eg, Thames or Nile" , "Eg, Trent" , "Moon - - (song)" .)