Crossword Genius

Neglectfully staying in and missing golf? Foolishness! (8)

Ross

I believe the answer is:

insanity

I'm a little stuck... Click here to teach me more about this clue!

'foolishness' is the definition.
(thesaurus)

'neglectfully staying in and missing golf?' is the wordplay.
I cannot quite understand how this works, but
'in' is found in the answer.
'and' could be 'n' (common abbreviation for 'and') and 'n' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for insanity that I've seen before include "Mental derangement" , "Lunacy, madness" , "Lunacy, derangement" , "mania" , "folly" .)

I've seen this clue in the Sydney Morning Herald.
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