The most common and most likely answer to this crossword clue is the 9 letter word BACKSTOPS
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More clues leading to the result BACKSTOPS
Buddy explains!

The straight part
We know that "baseball catchers" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case baseball catchers = backstops.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 BACKSTOPS mean?
BACKSTOPS noun- A thing or a person put in the rear or in the back of something to reinforce, hold, support.
- A default arrangement that holds if all else fails.
- A wall or fence behind home plate.
- A catcher; the position of catcher.
- (rounders) The player who stands immediately behind the striking base.
- The longstop.
- The wicket-keeper.
- Something serving to bolster or support a cover story etc.
- To serve as backstop for.
- To bolster, support.