Hate finishing last on a shaky steed (6)
I believe the answer is:
detest
'hate' is the definition.
(to detest is to hate or loathe)
'finishing last on a shaky steed' is the wordplay.
'finishing' indicates one should take the final letters (the letter which finishes the word).
'on' indicates putting letters inside.
'a shaky' is an anagram indicator.
The last letter of 'last' is 't'.
'steed' is an anagram of 'deest'.
't' placed within 'deest' is 'DETEST'.
(Other definitions for detest that I've seen before include "'Loathe, abhor (6)'" , "Dislike intensely, think badly of" , "Find repulsive" , "Loathe, hate intensely" , "Be unable to stand" .)