Strong impulse (4)
I believe the answer is:
urge
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">strong impulse</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for urge that I've seen before include "Constrain" , "Advise earnestly, spur" , "Encourage; impulse" , "Capital of Colombia" , "Implore" .)