One old silly (6)

I believe the answer is:

noodle

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

'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 Telegraph, The Globe and Mail and The Guardian.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.