Mistake some terrorists make (5)

I believe the answer is:

error

'mistake' is the definition.
(I know that mistake can be written as error)

'some terrorists make' is the wordplay.
'some' indicates the answer is hidden within the clue (some parts of the word are used).
'ERROR' can be found hidden inside 'terrorists make'.

(Other definitions for error that I've seen before include "A mistake or inaccuracy" , "Way of operating" , "Faux pas" , "Mistake, lapse" , "Boo-boo" .)

I've seen this clue in The Globe and Mail.

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