Featureless accommodation (4)
I believe the answer is:
flat
This clue is a double definition.
'featureless' is the first definition.
(I've seen this before)
'accommodation' is the second definition.
(thesaurus)
(Other definitions for flat that I've seen before include "Absolutely" , "Puncture" , "unexciting" , "character on the staff" , "Apartment; even" .)