One old silly (6)

I believe the answer is:

noodle

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'one old silly' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'one old silly' is the wordplay.
'silly' is an anagram indicator.
'one'+'old'='oneold'
'oneold' anagrammed gives 'NOODLE'.

Can you help me to learn more?

(Other definitions for noodle that I've seen before include "Simple person - in the soup?" , "Thin pasta strip" , "Staple of Chinese cuisine" , "Simpleton - strip of pasta" , "Pasta strip; silly person" .)

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

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