Staffed (6)
I believe the answer is:
manned
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">staffed</span>' is the definition.<br/ ><span class="explanation-format__explanation">(manning is a kind of staffing)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for manned that I've seen before include "Crewed" , "Supplied with people for service - men only" , "Staffed" , "Provided with workers" , "Provided with crew" .)