Attack persistently (7)
I believe the answer is:
bombard
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">attack persistently</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for bombard that I've seen before include "Organ stop" , "Attack with missiles" , "not working? Keep hitting" , "Pelt with missiles" , "Attack persistently" .)