Set out (5,5)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">set out</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for begin that I've seen before include "Commence" , "Monachem --" , "Launch" , "Israeli prime minister who shared the Nobel Peace Prize with President Sadat" , "Make a start" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">set out</span>' is the definition.<br/ ><span class="explanation-format__explanation">(sallying forth is a kind of setting out)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Another definition for sally forth that I've seen is " Go out".)