Total span broke after the happy event (9)
I believe the answer is:
'after the happy event' is the definition.
I can't tell whether this defines the answer.
'total span broke' is the wordplay.
'broke' indicates anagramming the letters.
'totalspan' anagrammed gives 'POSTNATAL'.
Can you help me to learn more?
(Other definitions for postnatal that I've seen before include "In period after birth" , "Immediately after birth" , "after delivery" , "a time of new life" .)