Holiday home (9)
'holiday home' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for villa that I've seen before include "Roman domicile" , "Classical country house" , "Country residence" , "Type of house" , "where 6 [VERDI] lived?" .)
(Another definition for weekender that I've seen is " One away from Friday to Monday?".)