The most common and most likely answer to this crossword clue is the 9 letter word ANAMNESIS
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More clues leading to the result ANAMNESIS
Buddy explains!

The straight part
We know that "recollection of Proust?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case recollection of proust? = anamnesis.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does ANAMNESIS mean?
ANAMNESIS noun- The ability to recall past events; recollection.
- The medical history of a patient.
- The mention of the past; quotation of exemplary authors from memory to establish one's authority.