Insiders upset about ordinary comments from mockers (9)

I believe the answer is:

derisions

'comments from mockers' is the definition.
(derisive comments)

'insiders upset about ordinary' is the wordplay.
'upset' indicates an anagram.
'about' means one lot of letters goes inside another.
'ordinary' becomes 'O' (abbreviation e.g. O-Levels).
'insiders' with letters rearranged gives 'derisins'.
'derisins' enclosing 'o' is 'DERISIONS'.

I've seen this clue in The Independent.

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