Some criticise song or performance that's raised expectations (9)

'expectations' is the definition.
Both the answer and definition are plural nouns.
Maybe there's a link between them I don't understand?

'some criticise song or performance that's raised' is the wordplay.
'some' indicates the answer is hidden within the clue (some parts of the word are used).
'that's raised' is a reversal indicator (going up in a down clue).
'sesongorp' is hidden within 'criticise song or performance'.
'sesongorp' written backwards gives 'PROGNOSES'.

Can you help me to learn more?