Utterance of the horse that refused the jump? (5)
I believe the answer is:
neigh
'utterance of' is the definition.
The definition suggests a singular noun which matches the answer.
'horse that refused the jump?' is the wordplay.
'horse' becomes 'H' (abbreviation as in horse power).
'that refused' becomes 'gien' (I can't explain this - if you can you should believe this answer much more).
'the jump?' shows that the letters should be reversed in order (I've seen 'jumping' mean this (in a down clue, letters jump up)).
'h'+'gien'='hgien'
'hgien' back-to-front is 'NEIGH'.
'the' is the link.
Can you help me to learn more?
(Other definitions for neigh that I've seen before include "Comment from Arab" , "beastly noise" , "Whinnying noise" , "Horse's whinny" , "heard on the farm" .)