A saint entertains company in Berkshire town (5)
I believe the answer is:
ascot
'berkshire town' is the definition.
(I've seen this before)
'a saint entertains company' is the wordplay.
'saint' becomes 'st'.
'entertains' means one lot of letters goes inside another.
'company' becomes 'co' (abbreviation).
'st' placed around 'co' is 'scot'.
'a'+'scot'='ASCOT'
'in' acts as a link.
(Other definitions for ascot that I've seen before include "Berkshire town, famous for horse racing" , "Society race meeting" , "prestigious meeting" , "Berkshire race course" , "Racecourse, home to the Gold Cup since 1807" .)