Threats can seem frightful (7)

I believe the answer is:

menaces

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

'threats' is the definition.
('menace' can be a synonym of 'threat')

'can seem frightful' is the wordplay.
'can seem' anagrams to 'MENACES'.
However, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for menaces that I've seen before include "Threats" , "Threatens" .)

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