Dark period (5)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">dark period</span>' is the definition.<br/ ><span class="explanation-format__explanation">(period of the day when it's dark)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for night that I've seen before include "Thing (anag)" , "Illumination needed now" , "From dusk until dawn" , "Darkness; see you in the morning" , "Time for bed" .)
(Other definitions for outage that I've seen before include "When one lacks power" , "Power cut" , "time of no power" , "Temporary suspension of operation" , "loss of power" .)