Writer, eccentric senior person getting allowance (9)

I believe the answer is:

pensioner

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'person getting allowance' is the definition.
I can't tell whether this defines the answer.

'writer eccentric senior' is the wordplay.
'writer' becomes 'pen' (something which writes).
'eccentric' indicates anagramming the letters.
'senior' is an anagram of 'sioner'.
'pen'+'sioner'='PENSIONER'

Can you help me to learn more?

(Other definitions for pensioner that I've seen before include "beneficiary of fund" , "Maybe Chelsea man" , "senior citizen" , "Retired person" , "One past retirement" .)

I've seen this clue in The Times.

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