The most common and most likely answer to this crossword clue is the 6 letter word ANYONE
I've seen this crossword clue in The Daily Telegraph
A
N
Y
O
N
E
More clues leading to the result ANYONE
- Unknown person in crazy area that has banned unknowns
- Nameless person greeting visiting queen
- Some person from Newcastle city centre, we hear
- Single person annoyed about missing date
- Unspecified individual in company on edge
- In a US city married undistinguished person
- A city number for Tom, Dick or Harry…
- Nobody in particular is fit to tour city
- Girl has only half a toy in her possession; who could it be?
- Accidentally annoy Egypt’s leader, an arbitrary individual
Buddy explains!

The straight part
We know that "Tom, Dick or Harry?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case tom, dick or harry? = anyone.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 ANYONE mean?
ANYONE pronoun- Any person; anybody.