Equestrian ability acquired by large majority (4,4)
I believe the answer is:
safe seat
'equestrian ability acquired' is the definition.
I know nothing about this answer so I can't tell whether this works.
'by large majority' is the wordplay.
I cannot really see how this works, but
'by' could be 'at' and 'at' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for safe seat that I've seen before include "Constituency unlikely to be lost" , "Parliamentary constituency with a substantial majority for the incumbent" , "Politician's dream" , "What the Uxbridge and South Ruislip constituency is for Boris" , "What politician would like" .)