Where horses possibly train mid-week (7)
I believe the answer is:
aintree
'where horses' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'possibly train mid-week' is the wordplay.
'possibly' indicates an anagram.
'mid-week' becomes 'ee' (the middle letters of 'week').
'train' with letters rearranged gives 'aintr'.
'aintr'+'ee'='AINTREE'
Can you help me to learn more?
(Other definitions for aintree that I've seen before include "Liverpool's racecourse" , "Home of the Grand National" , "Merseyside racecourse" , "Liverpool race course" , "Liverpool racecourse" .)