Seize the day (5,4)
I believe the answer is:
carpe diem
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">seize the day</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 carpe diem that I've seen before include "'Seize the day'" , "make the most of today" , "from Horace" , "Make the most of the present" , "Seize occasion" .)