Plan toast to be delivered after the happy event (9)

I believe the answer is:

postnatal

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'delivered after the happy event' is the definition.
I can't tell whether this definition defines the answer.

'plan toast to be' is the wordplay.
'to be' indicates anagramming the letters.
'plan'+'toast'='plantoast'
'plantoast' anagrammed gives 'POSTNATAL'.

Can you help me to learn more?

(Other definitions for postnatal that I've seen before include "after delivery" , "Immediately after birth" , "a time of new life" , "In period after birth" .)

I've seen this clue in The Daily Express.

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