Don (3,2)
I believe the answer is:
put on
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">don</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that don can be written as put on)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for put on that I've seen before include "Assume < present" , "in an unnatural way" , "Don clothes or stage play" , "Don; mount (a play)" , "Apply (to a surface) - present (on stage)" .)