Assemblies at which careers are studied? (12)

I believe the answer is:

convocations

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'assemblies at which careers are studied?' is the definition.
'convocations' can be an answer for 'assemblies' (convocation is a kind of assembly). I'm not certain of the remainder of the definition.

'assemblies at which careers' is the wordplay.
'assemblies' becomes 'con' (I can't explain this - if you can you should believe this answer much more).
'at which' is a charade indicator (letters next to each other).
'careers' becomes 'vocations' ('vocation' can be a synonym of 'career').
'con'+'vocations'='CONVOCATIONS'

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I've seen this clue in The Irish News.

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