Worker leant a convertible before the happy event (9)

I believe the answer is:

antenatal

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

'worker leant a convertible' is the wordplay.
'worker' becomes 'ant' (worker is a type of ant).
'convertible' indicates an anagram.
'leant'+'a'='leanta'
'leanta' with letters rearranged gives 'enatal'.
'ant'+'enatal'='ANTENATAL'

Can you help me to learn more?

(Other definitions for antenatal that I've seen before include "Check before delivery" , "before baby arrives" , "Preceding birth" , "before new one arrives" , "Pre-birth" .)

I've seen this clue in The Daily Express.

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