Stresses about an hour in seats (7)

I believe the answer is:

thrones

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

'in seats' is the definition.
'thrones' can be an answer for 'seats' (I've seen this before). I am not sure about the 'in' bit.

'stresses about an hour' is the wordplay.
'stresses' becomes 'tones' (I am not sure about this - if you are sure you should believe this answer much more).
'about' means one lot of letters goes inside another.
'an hour' becomes 'hr' (abbreviation).
'tones' placed around 'hr' is 'THRONES'.

Can you help me to learn more?

(Another definition for thrones that I've seen is " Seats for royalty".)

I've seen this clue in the Sydney Morning Herald.

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