Put on special clothes (5,2)
I believe the answer is:
dress up
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">put on special clothes</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 dress up that I've seen before include "Doctor" , "Put on fine clothes" , "Look smart" , "Wear one's best" , "Put on special clothes" .)