Saucy, pert (5)
I believe the answer is:
sassy
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">saucy</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that saucy can be written as sassy)</span><br/ ><br/ >'<span class="explanation-format__original">pert</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ ></span>
(Other definitions for sassy that I've seen before include "Cheeky American" , "(In US) saucy" , "Cheeky (US colloq.)" , "Impertinent (US colloq.)" , "Pert" .)