The most common and most likely answer to this crossword clue is the 9 letter word OSTRICHES
I've seen this crossword clue in The Guardian
O
S
T
R
I
C
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E
S
More clues leading to the result OSTRICHES
- Fast runners, East German, briefly carrying the most fat
- Birds love good person with lots of bread
- They refuse to accept East German money
- The majority lose money – wealth is for the birds!
- Some birds love to get instruction in developing chests
- People who refuse to face the reality of flightless birds
- Birds love saint with clover
- Saint in love with wealth gets exotic birds
- Heartily puts up big money for exotic birds
Buddy explains!

The straight part
We know that "Fast runners" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fast runners = ostriches.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 OSTRICHES mean?
OSTRICHES noun- A large flightless bird (Struthio camelus) native to Africa.
- One who buries one's head in the sand instead of acknowledging problems