Crossword Genius

What's often said in church following worshipper (8)

Ross

I believe the answer is:

idolater

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'worshipper' is the definition.
(I've seen this before)

'what's often said in church following' is the wordplay.
'what's often said in church' becomes 'ido' (I can't explain this - if you can you should give a lot more credence to this answer).
'following' becomes 'later' (I've seen this before).
'ido'+'later'='IDOLATER'

Can you help me to learn more?

(Other definitions for idolater that I've seen before include "Strong admirer" , "Person who worships graven images" , "I love a religious image" , "Tailored like pagan worshipper" , "Heathen" .)

I've seen this clue in The Telegraph.
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