Old one suspects the local fool (6)

I believe the answer is:

noodle

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'the local fool' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'old one suspects' is the wordplay.
'suspects' indicates an anagram (I've seen 'suspect' mean this).
'old'+'one'='oldone'
'oldone' with letters rearranged gives 'NOODLE'.

Can you help me to learn more?

(Other definitions for noodle that I've seen before include "Foolish person or slangy head" , "Egg pasta" , "In slang, a foolish person or just the head" , "Goose" , "Ribbon strip of pasta" .)

I've seen this clue in the Irish Times.

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