Annoying introspective music teacher spat when upset (9)

I believe the answer is:

worrisome

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'annoying' is the definition.
(thesaurus)

'introspective music teacher spat when upset' is the wordplay.
'introspective music' becomes 'emo' (I've seen this before. I am not sure about the 'introspective' bit.).
'teacher' becomes 'sir' (way of addressing a male teacher).
'spat' becomes 'row' (I've seen this in another clue).
'when upset' says the letters should be written backwards (in a down clue - set, written, up).
'emo'+'sir'+'row'='emosirrow'
'emosirrow' in reverse letter order is 'WORRISOME'.

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I've seen this clue in The Independent.

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