Crossword Genius

Arranged free hat for one from the past? (10)

Ross

I believe the answer is:

forefather

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'one from the past?' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'arranged free hat for' is the wordplay.
'arranged' indicates an anagram (letters rearranged).
'free'+'hat'+'for'='freehatfor'
'freehatfor' anagrammed gives 'FOREFATHER'.

Can you help me to learn more?

(Another definition for forefather that I've seen is " Hamlet's rude ancestor".)

I've seen this clue in The Times.
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