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Mailer's conversion to practical appreciation (7)

Ross

I believe the answer is:

realism

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'practical appreciation' is the definition.
The definition and answer can be both related to thinking as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'mailer's conversion' is the wordplay.
'conversion' indicates an anagram.
'mailers' with letters rearranged gives 'REALISM'.

'to' acts as a link.

Can you help me to learn more?

(Other definitions for realism that I've seen before include "Practical approach" , "Reliance on facts" , "Practicality of mailers" , "Awareness of the facts of life" , "Pragmatic view" .)

I've seen this clue in The Globe and Mail.
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