One that's important with media boss when retired (5)

I believe the answer is:

inbed

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'retired' is the definition.
Both the definition and answer are past participle verbs.
Maybe there's an association between them I don't understand?

'one that's important with media boss' is the wordplay.
'one' becomes 'i' (Roman numeral).
'that's important' becomes 'NB' (short for nota bene, noting something important).
'with' says to put letters next to each other.
'media boss' becomes 'ed' (short for editor).
'i'+'nb'+'ed'='INBED'

'when' acts as a link.

Can you help me to learn more?

I've seen this clue in The Irish Times.

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