Following delivery job with role outside in uniform (10)

'following delivery' is the definition.
Although both the answer and definition are adjectives, I don't see how they can define each other.

'job with role outside in uniform' is the wordplay.
'job' becomes 'post' (post is a kind of job).
'with' says to put letters next to each other.
'role' becomes 'part' (eg a part or role in a film).
'outside in' says to hollow out the word (remove centre letters) (only the letters on the outside).
'uniform' with its centre removed is 'um'.
'post'+'part'+'um'='POSTPARTUM'

Can you help me to learn more?