The most common and most likely answer to this crossword clue is the 6 letter word EPONYM
I've seen this crossword clue in The Guardian
E
P
O
N
Y
M
More clues leading to the result EPONYM
- Horse breaking into a sort of dash in Dallas or Washington?
- I'm surprised by refusal to back name-giver
- Silhouette's one small horse breaking into dash
- English maiden keeping animal for riding: Black Beauty is one
- Cardigan, perhaps around £25, yours truly returned
- One turned up clutching £25 for Tom Jones?
- Label derived from name of space occupied by horse
- Name for Goliath up astride horse
- Taken name of horse amongst outsiders in Epsom
- £25 in English money for Guinness, Beck’s or Pimm’s?
Buddy explains!

The straight part
We know that "Label derived from name" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case label derived from name = eponym.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 EPONYM mean?
EPONYM noun- A real or fictitious person's name that has given rise to the name of a particular item.
- A word formed from a real or fictive person’s name.
- (by extension) A word formed from a real or fictive place or thing.