Punch-drunk (9)

I believe the answer is:

slaphappy

'punch-drunk' is the definition.
(I know that punch-drunk can be written as slaphappy)

This is the entire clue.

(Other definitions for slaphappy that I've seen before include "Cheerfully casual" , "careless" , "Cheerfully irresponsible" , "Silly -- unmethodical -- punch-drunk" .)

I've seen this clue in The Wall Street Journal.

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