Concentrated artillery bombardment (7)
I believe the answer is:
barrage
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">concentrated artillery bombardment</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 barrage that I've seen before include "Continuous artillery fire" , "a lot of shells" , "flood protection" , "Continuous fusillade or a torrent of questions" , "Artillery bombardment; barrier across a river" .)