Crossword Genius

Rapidly knock off, thus showing laziness (4)

Ross

I believe the answer is:

idly

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'thus showing laziness' is the definition.
I can't judge whether this definition defines the answer.

'rapidly knock off' is the wordplay.
'knock' becomes 'rap' (synonyms).
'off' is a deletion indicator (some letters taken off).
'rapidly' with 'rap' removed is 'IDLY'.

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(Other definitions for idly that I've seen before include "In a lazy fashion" , "How people may stand by" , "without purpose" , "In a lazy manner" , "without good reason" .)

I've seen this clue in the Evening Standard.
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