Accommodation lacking sparkle (4)
I believe the answer is:
flat
This clue is a double definition.
'accommodation' is the first definition.
(I've seen this before)
'lacking sparkle' is the second definition.
(I've seen this in another clue)
(Other definitions for flat that I've seen before include "character on the staff" , "Apartment - on the level" , "without qualification" , "like some races" , "Absolutely" .)