Mayday! (4)
(Other definitions for help that I've seen before include "Succour" , "Take what you want" , "Lend a hand" , "Support" , "Beatles' album; assist" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">mayday</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in other clues)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for sos that I've seen before include "Call for help" , "International distress code" , "plea" , "Mayday call" , "request for aid" .)