Dip in water treated asp bite (7)

I believe the answer is:

baptise

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'dip in water' is the definition.
'baptise' can be an answer for 'water' ('water'->'baptize' is in my internal thesaurus and 'ize'->'ise'). I am unsure of the 'dip in' bit.

'treated asp bite' is the wordplay.
'treated' is an anagram indicator.
'asp'+'bite'='aspbite'
'aspbite' anagrammed gives 'BAPTISE'.

Can you help me to learn more?

(Other definitions for baptise that I've seen before include "First Roman Catholic sacrament" , "Christen" , "Give name" , "Administer the first RC sacrament" .)

I've seen this clue in The Sun.

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