Mention dean fixed votes (9)

I believe the answer is:

referenda

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'votes' is the definition.
(referendum is a kind of vote)

'mention dean fixed' is the wordplay.
'mention' becomes 'refer' (I can't explain this - if you can you should believe this answer much more).
'fixed' is an anagram indicator.
'dean' is an anagram of 'enda'.
'refer'+'enda'='REFERENDA'

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(Other definitions for referenda that I've seen before include "decisions for people" , "National votes or plebiscites (9)" , "Votes put to country generally 9)" , "General votes" , "mass votes" .)

I've seen this clue in The Mirror and The Daily Express.

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