Swoop (6)
I believe the answer is:
pounce
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">swoop</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that swoop can be written as pounce)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for pounce that I've seen before include "Strike" , "Spring down on and grasp" , "Spring to catch" , "Spring or swoop down on to attack" , "(Of cat) sudden leap to seize prey" .)