Crossword Genius

Daughter wears only nice pants, sitting on her arse (9)

Ross

I believe the answer is:

indolency

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'sitting on her arse' is the definition.
I can't tell whether this definition defines the answer.

'daughter wears only nice pants' is the wordplay.
'daughter' becomes 'd' (genealogical abbreviation).
'wears' is an insertion indicator.
'pants' is an anagram indicator (UK informal term for 'nonsense' or 'rubbish').
'only'+'nice'='onlynice'
'onlynice' anagrammed gives 'inolency'.
'd' put inside 'inolency' is 'INDOLENCY'.

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I've seen this clue in The Independent.
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