Cryptic crossword clue
Greek character, after the due time, left individual collector initially concerned with this hobby 10

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

I've seen this crossword clue in The Daily Telegraph
P
H
I
L
A
T
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L
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C

Buddy explains!

The straight part
We know that "concerned with this hobby" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case concerned with this hobby = philatelic.
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.

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