Awfully energetic around a relative (5-5)

I believe the answer is:

great-niece

'relative' is the definition.
(I've seen this before)

'awfully energetic around a' is the wordplay.
'awfully' is an anagram indicator.
'around' means one lot of letters goes inside another.
'energetic' is an anagram of 'gretniece'.
'gretniece' enclosing 'a' is 'GREAT-NIECE'.

I've seen this clue in The Times.

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