Crossword Genius

Tries subtleness for a change in this type of correspondence (8,7)

Ross

I believe the answer is:

business letters

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'this type of correspondence' is the definition.
Although both the answer and 'type' are nouns, they are not in the same form of the noun.

'tries subtleness for a change' is the wordplay.
'for a change' is an anagram indicator.
'tries'+'subtleness'='triessubtleness'
'triessubtleness' anagrammed gives 'BUSINESS LETTERS'.

'in' acts as a link.

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I've seen this clue in the Sydney Morning Herald.
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