Stress notes in wrong order (7)

I believe the answer is:

tension

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

'stress' is the definition.
(I know that tension is a type of stress)

'notes in wrong order' is the wordplay.
'notes in' can be anagrammed to 'TENSION'.
But, I'm not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for tension that I've seen before include "Mental or emotional strain" , "Strained state" , "Assay" , "Strain, nervousness" , "Conflict" .)

I've seen this clue in The Irish News.

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