One day accepting church is cold (4)
I believe the answer is:
iced
'is cold' is the definition.
(I've seen this before)
'one day accepting church' is the wordplay.
'one' becomes 'i' (Roman numeral**).
'day' becomes 'd'.
'accepting' indicates putting letters inside.
'church' becomes 'ce' (abbreviation for Church of England).
'i'+'d'='id'
'id' placed around 'ce' is 'ICED'.
(Other definitions for iced that I've seen before include "Glazed" , "Chilled - killed" , "Having a sugary coating" , "What cake might be" , "Decorated (a cake)" .)