The most common and most likely answer to this crossword clue is the 10 letter word ASSIMILATE
I've seen this crossword clue in The Daily Telegraph
A
S
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More clues leading to the result ASSIMILATE
Buddy explains!

The straight part
We know that "Take in" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case take in = assimilate.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 ASSIMILATE mean?
ASSIMILATE noun- Something that is or has been assimilated.
- To incorporate nutrients into the body, especially after digestion.
- To incorporate or absorb (knowledge) into the mind.
- To absorb (a person or people) into a community or culture.
- To compare to something similar.
- To bring to a likeness or to conformity; to cause a resemblance between.
- To become similar.
- To be incorporated or absorbed into something.