Conferences upset MP so? I say! (8)

I believe the answer is:

symposia

'conferences' is the definition.
(symposium is a kind of conference)

'upset mp so? i say' is the wordplay.
'upset' is an anagram indicator.
'mp'+'so'+'i'+'say'='mpsoisay'
'mpsoisay' is an anagram of 'SYMPOSIA'.

(Other definitions for symposia that I've seen before include "Specialist conferences" , "Academic conferences" .)

I've seen this clue in The Guardian.

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