Round up (6)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">round up</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 muster that I've seen before include "Assemble for duty" , "Mobilize" , "Assemble, gather together" , "marshal" , "Gather or bring together" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">round up</span>' is the definition.<br/ ><span class="explanation-format__explanation">(as in herding or rounding up sheep)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for herd that I've seen before include "Collection of cattle" , "Stock of cattle" , "Crowd of cattle" , "Group of animals of one kind" , "Group of cows, elephants etc" .)