Toxic accommodation with short lobby (6)
I believe the answer is:
lethal
'toxic' is the definition.
(thesaurus)
'accommodation with short lobby' is the wordplay.
'accommodation with' becomes 'let' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'short' means to remove the last letter.
'lobby' becomes 'hall' ('hall' can be a synonym of 'lobby').
'hall' with its final letter taken off is 'hal'.
'let'+'hal'='LETHAL'
Can you help me to learn more?
(Other definitions for lethal that I've seen before include "Deadly dangerous" , "Noxious" , "Terminal" , "describing a killer?" , "Enough to cause death" .)