Extend a chain around villa (5)
I believe the answer is:
dacha
'villa' is the definition.
(I have seen 'Russian villa ' mean 'dacha' so perhaps 'villa' could also mean 'dacha')
'extend a chain around' is the wordplay.
'around' indicates a hidden word.
'DACHA' is hidden in the letters of 'extend a chain'.
(Other definitions for dacha that I've seen before include "A Russian country cottage" , "Russian second home" , "Russian's second home in the country" , "property overseas" , "Vladimir's cottage" .)