The most common and most likely answer to this crossword clue is the 9 letter word NOOSPHERE
I've seen this crossword clue in Financial Times
N
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Buddy explains!
The straight part
We know that "Teilhard de Chardin’s human intelligence and memory" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case teilhard de chardin’s human intelligence and memory = noosphere.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 NOOSPHERE mean?
NOOSPHERE noun- A theoretical stage of evolutionary development, associated with consciousness, the mind, and personal relationships (often with reference to the writings of Teilhard de Chardin).