Hesitated, about to call side out (10)

I believe the answer is:

oscillated

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'hesitated' is the definition.
Although both the answer and definition are past participle verbs, I can't see how they can define each other.

'to call side out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'to'+'call'+'side'='tocallside'
'tocallside' anagrammed gives 'OSCILLATED'.

'about' acts as a link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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