Crossword Genius

Countless sources of useful news were informative (6)

Ross

I believe the answer is:

untold

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

'countless' is the definition.
(I know that countless can be written as untold)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for untold that I've seen before include "missing relations" , "Too many to be counted; not narrated" , "Not narrated or measured" , "What's indescribable" , "Incalculable amount" .)

I've seen this clue in The Independent.
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