He doesn't go for a horse that will finish (6)
I believe the answer is:
stayer
'horse that will finish' is the definition.
The answer and definition can be both animals as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'he doesn't go for a' is the wordplay.
I cannot quite understand how this works, but
'a' is present in the answer.
'he' could be 'tye' and 'tye' is located in the remaining letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for stayer that I've seen before include "Racehorse perhaps" , "Long-distance runner, rather than sprinter" , "One with stamina" , "Person with perseverance" , "Persistent person" .)