Actually, "nymphet” is misused and not in a kind way (17)

I believe the answer is:

unsympathetically

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'actually nymphet is misused and not in a kind way' is the definition.
I can't tell whether this definition defines the answer.

'actually nymphet is misused' is the wordplay.
'misused' indicates anagramming the letters.
'actually'+'nymphet'+'is'='actuallynymphetis'
'actuallynymphetis' anagrammed gives 'UNSYMPATHETICALLY'.

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I've seen this clue in The Times.

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