"Swanee" singer Al (6)
I believe the answer is:
jolson
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">swanee singer al</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for jolson that I've seen before include "Al . . . . . ., great American ''mammy'' singer (6)" , "Old singer" .)