Preach to get one remiss sorted out (9)

I believe the answer is:

sermonise

'preach' is the definition.
('preach'->'sermonize' is in my internal thesaurus and 'ize'->'ise')

'get one remiss sorted out' is the wordplay.
'get' says to put letters next to each other.
'sorted out' is an anagram indicator.
'one' next to 'remiss' is 'oneremiss'.
'oneremiss' anagrammed gives 'SERMONISE'.

'to' acts as a link.

(Another definition for sermonise that I've seen is " what vicars do?".)

I've seen this clue in The Telegraph.

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