Loose dress or blouse (5)
I believe the answer is:
smock
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">loose dress or blouse</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for smock that I've seen before include "Loose dress or blouse" , "Loose outer garment" , "Artist's loose overall" , "Loose overall or dress" , "Artist's, peasant's, overall" .)