Ed sets out to break horses (6)
I believe the answer is:
steeds
'break horses' is the definition.
'steeds' can be an answer for 'horses' (steed is a kind of horse). I am not sure about the 'break' bit.
'ed sets out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'ed'+'sets'='edsets'
'edsets' anagrammed gives 'STEEDS'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for steeds that I've seen before include "Horses for riding" , "Poetic horses" , "Warhorses" , "Horses, trusty perhaps" , "Old conditions" .)