Worshippers' bathing ritual starts with immersion in cleanest fluid (10)

'worshippers' bathing ritual starts with immersion in cleanest fluid' is the definition.
I can't judge whether this definition defines the answer.

'bathing ritual starts with immersion in cleanest fluid' is the wordplay.
'starts' suggests taking the first letters.
'with immersion in' means one lot of letters goes inside another.
'fluid' is an anagram indicator.
The initial letters of 'bathing ritual' is 'br'.
'cleanest' anagrammed gives 'celeants'.
'br' put within 'celeants' is 'CELEBRANTS'.