Is one entering US flat / apartment? (10)
I believe the answer is:
maisonette
'apartment?' is the definition.
(I know that maisonette is a type of apartment)
'is one entering us flat' is the wordplay.
'entering' is an insertion indicator.
'us flat' becomes 'matte' (I can't justify this - if you can you should believe this answer much more).
'is'+'one'='isone'
'isone' put within 'matte' is 'MAISONETTE'.
Can you help me to learn more?
(Other definitions for maisonette that I've seen before include "possible place to live" , "starter home?" , "Self-contained living accommodation on two floors" , "Two-story flat" , "Small house, flat" .)