Course served in Anna's cottage (5)
I believe the answer is:
ascot
'course' is the definition.
(Ascot is a racecourse)
'in anna's cottage' is the wordplay.
'in' says the answer is hidden in the clue.
'ASCOT' can be found hidden inside 'annas cottage'.
'served' acts as a link.
(Other definitions for ascot that I've seen before include "English racecourse in Berkshire" , "English course" , "Horse-racing venue" , "sporting venue" , "somewhere in Berks" .)