The most common and most likely answer to this crossword clue is the 7 letter word BASEMAN
B
A
S
E
M
A
N
Buddy explains!
The straight part
We know that "Infielder" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case infielder = baseman.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 BASEMAN mean?
BASEMAN noun- A player positioned at or near a base: first baseman, second baseman or third baseman.