One's energy returns, getting fizzy drink (5)

I believe the answer is:

pepsi

'fizzy drink' is the definition.
(I know that Pepsi is a fizzy drink)

'one's energy returns' is the wordplay.
'one's' becomes 'i's' (Roman numeral).
'energy' becomes 'pep' (personal energy, vim).
'returns' says the letters should be written in reverse.
'is'+'pep'='ispep'
'ispep' written backwards gives 'PEPSI'.

'getting' is the link.

(Another definition for pepsi that I've seen is " drink".)

I've seen this clue in The Times.

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