Spooky home secured by relative (8)
I believe the answer is:
sinister
'spooky' is the definition.
(I've seen this before)
'home secured by relative' is the wordplay.
'home' becomes 'in' (to be in is to be (at) home).
'secured by' indicates putting letters inside (inserted letters are held or secured).
'relative' becomes 'sister' (sister is a kind of relative).
'in' going inside 'sister' is 'SINISTER'.
(Other definitions for sinister that I've seen before include "Very unpleasant" , "Eerie, alarming" , "Spooky" , "Disquieting" , "Malign, ominous" .)