Organisation founded by William Booth (9,4)
I believe the answer is:
salvation army
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">organisation founded by william booth</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 salvation army that I've seen before include "peaceful force" , "Christian group" , "The Booths' creation" , "The Booths' organisation" , "Christian body noted for social work and bands" .)