Dusk to dawn (5)
I believe the answer is:
night
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">dusk to dawn</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 night that I've seen before include "Hours of darkness" , "''Twas the ... before Christmas, when all through the house / Not a creature was stirring, not even a mouse''" , "Dark period" , "See 8" , "Illumination needed now" .)