Six lines above a house (5)
I believe the answer is:
villa
'house' is the definition.
(I know that villa is a type of house)
'six lines above a' is the wordplay.
'six' becomes 'VI' (Roman numerals).
'lines' becomes 'll' (an abbreviation for line written twice).
'above' is a charade indicator (letters next to each other).
'vi'+'ll'+'a'='VILLA'
(Other definitions for villa that I've seen before include "Holiday residence" , "where 6 [VERDI] lived?" , "See 3" , "Classical country house" , "Detached house" .)