Spectres (6)
I believe the answer is:
ghosts
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">spectres</span>' is the definition.<br/ ><span class="explanation-format__explanation">('ghost' can be a synonym of 'spectre')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ghosts that I've seen before include "Spirits or apparitions" , "Spooks, spectres" , "Spectres, wraiths" , "Apparitions of a dead people" , "Writes for another; Ibsen play" .)