Sounded or rather sound like an animal (5)

I believe the answer is:

neigh

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'sound like an animal' is the definition.
'neigh' can be an answer for 'sound' (I have seen 'Sound of horse' mean 'neigh' so perhaps 'sound' could also mean 'neigh'). I am unsure of the 'like an animal' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for neigh that I've seen before include "Whicker" , "High-pitched cry of a horse" , "heard on the farm" , "Negative sound of horse?" , "Horse's noise" .)

I've seen this clue in The Sunday Times.

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