Crossword Genius

Sex, according to Roman church? (4)

Ross

I believe the answer is:

vice

I'm a little stuck... Click here to teach me more about this clue!

'roman church?' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'sex according' is the wordplay.
'sex' becomes 'VI' (VI in Roman numerals - 'sex' is 'six' in Latin).
'according' becomes 'ce' (I can't explain this - if you can you should believe this answer much more).
'vi'+'ce'='VICE'

'to' acts as a link.

Can you help me to learn more?

(Other definitions for vice that I've seen before include "Preposition meaning in place of" , "Gripper - in place of - immorality" , "Gripping tool - depravity" , "something antisocial" , "In place of - depravity" .)

I've seen this clue in The Independent.
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