Crossword Genius

Message posh school sent up (4)

Ross

I believe the answer is:

note

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

'posh school sent up' is the wordplay.
'posh school' becomes 'Eton'.
'sent up' is a reversal indicator.
'eton' backwards is 'NOTE'.

(Other definitions for note that I've seen before include "Brief letter - distinction" , "A, B or C, for example - short message" , "Short informal letter" , "Observe; paper money" , "held by piano teacher" .)

I've seen this clue in The Sun.
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