Source of bleats and whinnies (6)

I believe the answer is:

stable

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

'source of bleats' is the wordplay.
'source of' indicates anagramming the letters.
'bleats' anagrammed gives 'STABLE'.

Can you help me to learn more?

(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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