"Sad to say . . ." (4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sad to say</span>' is the definition.<br/ ><span class="explanation-format__explanation">('alas' is said before reporting something sad)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for alas that I've seen before include "Oh dear!" , "Expression of grief/pity" , "Antipodean island state" , "Archaic exclamation of sorrow or regret" , "What a shame!" .)
(Another definition for unfortunately that I've seen is " Alas".)