Worry greatly (5)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">worry greatly</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for agonise that I've seen before include "Worry greatly (over something); I go sane (anag.)" , "Be in torments of indecision" , "rack" , "Worry intensely" , "Struggle mentally" .)
(Other definitions for alarm that I've seen before include "Noise giving warning" , "Security device" , "Great concern" , "Warning of danger" , "Unnerve" .)