Not related (6)

I believe the answer is:

untold

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'not related' is the definition.
The answer and definition are different parts of speech. However, adjectives and past participle verbs can occasionally mean the same thing.

'not related' is the wordplay.
'not' becomes 'un' (prefix meaning 'not').
'related' becomes 'told' (I've seen this before).
'un'+'told'='UNTOLD'

Can you help me to learn more?

(Other definitions for untold that I've seen before include "Unspoken - inexpressible - uncounted" , "Innumerable - secret" , "missing relations" , "Incalculable amount" , "like a kept secret?" .)

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

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