The most common and most likely answer to this crossword clue is the 10 letter word SHORTSTOPS
I've seen this crossword clue in The Daily Telegraph
S
H
O
R
T
S
T
O
P
S
Buddy explains!

The straight part
We know that "Baseball fielders" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case baseball fielders = shortstops.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 SHORTSTOPS mean?
SHORTSTOPS noun- The infield defensive player that stands between the second baseman and the third baseman.
- A nimble defender.
- A player who is short of money.