Include in account old secrets, never before revealed (6)

I believe the answer is:

untold

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'never before revealed' is the definition.
The answer and definition are different parts of speech. However, past participle verbs and adjectives can occasionally define each other.

'include in account old secrets' is the wordplay.
'include in' indicates a hidden word (I've seen 'included in' mean this).
'UNTOLD' is hidden in the letters of 'account old secrets'.

Can you help me to learn more?

(Other definitions for untold that I've seen before include "missing relations" , "Innumerable - secret" , "Unspoken - inexpressible - uncounted" , "beyond description?" , "Not disclosed - fabulous!" .)

I've seen this clue in The Irish Times.

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