When at home, I get Denis to unpack (6)
I believe the answer is:
inside
'when at home' is the definition.
I can't judge whether this definition defines the answer.
'i get denis to unpack' is the wordplay.
'get' is an insertion indicator.
'to unpack' indicates anagramming the letters (I've seen 'unpacked' mean this (I've seen this in other clues)).
'denis' with letters rearranged gives 'insde'.
'i' put inside 'insde' is 'INSIDE'.
Can you help me to learn more?
(Other definitions for inside that I've seen before include "Behind bars (sl.)" , "Stomach etc - in prison?" , "Imprisoned" , "undercover" , "Interior - in prison" .)