Council convened by Dyson? (5)
I believe the answer is:
synod
'council' is the definition.
(synod is a kind of council)
'convened by dyson?' is the wordplay.
'dyson' can be anagrammed to 'SYNOD'.
But, I'm not sure how this is indicated.
Can you help me to learn more?
(Other definitions for synod that I've seen before include "Church council" , "Ecclesiastical gathering" , "Church assembly" , "Ecumenical council" , "Ecclesiastic council" .)