Cryptic crossword clue
Volunteers to follow one old Greek character 4

The most common and most likely answer to this crossword clue is the 4 letter word IOTA

I've seen this crossword clue in Financial Times
I
O
T
A


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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 IOTA mean?

IOTA noun
  1. The ninth letter of the Greek alphabet.
  2. A jot; a very small, insignificant quantity.

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