Let's Do It songwriter (4,6)
I believe the answer is:
cole porter
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">let's do it songwriter</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 cole porter that I've seen before include "Broadway composer" , "US man of note" , "Man responsible for standards" , "Let's Do It songwriter" .)