Liz poorly inside accommodation (6)
I believe the answer is:
billet
'accommodation' is the definition.
(I've seen this before)
'liz poorly inside' is the wordplay.
'liz' becomes 'bet' (I can't justify this - if you can you should give a lot more credence to this answer).
'poorly' becomes 'ill' (synonyms).
'inside' indicates putting letters inside.
'bet' placed around 'ill' is 'BILLET'.
Can you help me to learn more?
(Other definitions for billet that I've seen before include "Place for a soldier to stay" , "Housing for military personnel" , "Piece of wood - bar of metal - place to stay" , "Job" , "Lodging for military personnel" .)