Source of bleats and whinnies (6)

I believe the answer is:

stable

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'and whinnies' is the definition.
I can't judge whether this defines the answer.

'source of bleats' is the wordplay.
'source of' is an anagram indicator.
'bleats' with letters rearranged gives 'STABLE'.

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(Other definitions for stable that I've seen before include "Fixed and unchanging" , "Firmly-fixed; building" , "Firmly established" , "Standing firm" , "providing accommodation for Arabs, perhaps" .)

I've seen this clue in the Evening Standard.

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