Tells tales of terrible snakes (6)

I believe the answer is:

sneaks

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

'tells tales' is the definition.
I can't tell whether this defines the answer.

'terrible snakes' is the wordplay.
'terrible' is an anagram indicator.
'snakes' anagrammed gives 'SNEAKS'.

'of' is the link.

Can you help me to learn more?

(Other definitions for sneaks that I've seen before include "Moves craftily" , "In school slang, tells tales" , "Informers" .)

I've seen this clue in the Evening Standard.

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