Use divining rod (5)
I believe the answer is:
dowse
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">use divining rod</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 dowse that I've seen before include "Look for water with a divining rod" , "Search for water using hazel rod" , "try to find water" , "Extinguish" , "Detect underground water" .)