Crossword Genius

Declare writers have one on retirement? (5,7)

Ross

I believe the answer is:

state pension

I'm a little stuck... Click here to teach me more about this clue!

'retirement?' is the definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?

'declare writers have one on' is the wordplay.
'declare' becomes 'state' (I've seen this before).
'writers' becomes 'pens' (writing implements).
'have' is a charade indicator (letters next to each other).
'one' becomes 'i' (Roman numeral).
'state'+'pens'+'i'+'on'='STATE PENSION'

Can you help me to learn more?

(Another definition for state pension that I've seen is " Government payment to retired person".)

I've seen this clue in The Globe and Mail.
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