How one spent holidays - or half of them possibly (4)
I believe the answer is:
idly
'how' is the definition.
Both the definition and answer are adverbs. Maybe there's an association between them I don't understand?
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for idly that I've seen before include "How one may stand by" , "How one stands by?" , "In a lazy fashion" , "In a lazy manner" , "without purpose" .)