Terrorism’s oversight (5)

I believe the answer is:

error

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

'oversight' is the definition.
(I've seen this in another clue)

'terrorism's' is the wordplay.
'ERROR' is hidden within the letters.
But, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for error that I've seen before include "Solecism" , "Bloomer, blunder" , "Mistake from terrorist" , "Miscalculation" , "Bug" .)

I've seen this clue in The Mirror.

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