Negative sound - from a horse (5)
I believe the answer is:
neigh
This clue might be a double definition.
'negative' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
'sound from a horse' is the second definition.
(I've seen this before)
Can you help me to learn more?
(Other definitions for neigh that I've seen before include "Equine utterance" , "Horse's cry" , "Negative sound of horse?" , "Horse's noise" , "Mare's cry, e.g." .)