Cryptic crossword clue
Study old diary as part of basic thematic study 10

The most common and most likely answer to this crossword clue is the 10 letter word DENDROLOGY

I've seen this crossword clue in Independent
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The straight part
We know that "thematic study" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case thematic study = dendrology.
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 DENDROLOGY mean?

DENDROLOGY noun
  1. The study of trees and other woody plants

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