A small country dwelling in Berkshire town? (5)
I believe the answer is:
ascot
'berkshire town?' is the definition.
(town in Berkshire)
'a small country dwelling' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'country dwelling' becomes 'cot' (archaic word for a cottage).
'a'+'s'+'cot'='ASCOT'
'in' acts as a link.
(Other definitions for ascot that I've seen before include "track" , "Racecourse and cravat" , "Tie or cravat" , "Racecourse, home to the Gold Cup since 1807" , "Racecourse with royal associations" .)