Small willow (5)
I believe the answer is:
osier
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">small willow</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 osier that I've seen before include "may be a bit of a basket" , "Basket-making material" , "Willow for making baskets" , "Willow growing shoots used in basketwork" , "Bit of tree" .)