Tom Daley inverts, jumping without restraint (15)

I believe the answer is:

demonstratively

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'without restraint' is the definition.
I can't tell whether this defines the answer.

'tom daley inverts jumping' is the wordplay.
'jumping' is an anagram indicator.
'tom'+'daley'+'inverts'='tomdaleyinverts'
'tomdaleyinverts' is an anagram of 'DEMONSTRATIVELY'.

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I've seen this clue in The Independent.

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