Crossword Genius

Too lazy to fillet? (4,4)

Ross

I believe the answer is:

bone idle

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'too lazy to fillet?' is the definition.
I can't tell whether this defines the answer.

'lazy to fillet?' is the wordplay.
'lazy' becomes 'idle' (similar in meaning).
'to' means one lot of letters go next to another (I've seen this in other clues).
'fillet?' becomes 'bone' (I've seen this in another clue).
'idle' after 'bone' is 'BONE-IDLE'.

Can you help me to learn more?

(Other definitions for bone idle that I've seen before include "Very lazy, from the marrow out" , "Really lazy in ossified way" , "staff may be?" , "Very lazy from the inside out" , "Extremely lazy" .)

I've seen this clue in the Evening Standard.
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