Sally (6)
I believe the answer is:
sortie
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sally</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for sortie that I've seen before include "Attack by a besieged garrison" , "(Siege) breakout" , "Short trip; attack" , "Operational flight by a bomber or fighter" , "Offensive" .)