Ecumenical council takes part in heresy, no doubt (5)

I believe the answer is:

synod

'ecumenical council' is the definition.

'part in heresy no doubt' is the wordplay.
'part in' indicates a hidden word.
'SYNOD' is hidden in the letters of 'heresy no doubt'.

'takes' is the link.

(Other definitions for synod that I've seen before include "Ecclesiastical assembly" , "Church assembly" , "Council of bishops" , "Ecumenical council" , "Church council" .)

I've seen this clue in The Independent.

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