Converts writing style with training (10)

I believe the answer is:

proselytes

I'm a little stuck... Click here to teach me more about this clue!

'converts' is the definition.
(proselyte is a kind of convert)

'writing style with training' is the wordplay.
I cannot really see how this works, but
'writing' could be 'prose' (I've seen this in other clues) and 'prose' is present in the answer.
an anagram of 'style' is 'lytes' which is present in the answer.
This accounts for all the letters.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Independent.

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