Absorption transforming a Latin mission endlessly (12)

I believe the answer is:

assimilation

'absorption' is the definition.
(synonyms)

'transforming a latin mission endlessly' is the wordplay.
'transforming' is an anagram indicator (I've seen this in other clues).
'endlessly' means to remove the last letter.
'a'+'latin'+'mission'='alatinmission'
'alatinmission' with its last letter taken off is 'alatinmissio'.
'alatinmissio' is an anagram of 'ASSIMILATION'.

(Another definition for assimilation that I've seen is " taking in slowly".)

I've seen this clue in The Times.

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