Stuffs home with security, initially (4)
I believe the answer is:
pads
'stuffs' is the definition.
(pad is a kind of stuff)
'home with security initially' is the wordplay.
'home' becomes 'pad' (pad can mean a person's home).
'with' means one lot of letters go next to another.
'initially' suggests taking the first letters.
The initial letter of 'security' is 's'.
'pad'+'s'='PADS'
(Other definitions for pads that I've seen before include "Cricket leg-guards" , "Treads" , "Lines or stuffs with soft material" , "tablets" , "Walks softly" .)