Records firsts in one Mediaeval English course (5)
I believe the answer is:
epsom
'english course' is the definition.
'epsom' can be an answer for 'course' (a race course). I'm not certain of the 'english' bit.
'records firsts in one mediaeval' is the wordplay.
'records' becomes 'EPs' (EP is a type of record).
'firsts in' suggests taking the first letters (I've seen 'first in' mean this).
The initial letters of 'one mediaeval' is 'om'.
'eps'+'om'='EPSOM'
Can you help me to learn more?
(Other definitions for epsom that I've seen before include "Mopes around in English horse-racing venue" , "Classic venue" , "Derby and Oaks racecourse" , "English town, of course?" , "Mopes around English Derby venue" .)