The most common and most likely answer to this crossword clue is the 7 letter word BATSMAN
I've seen this crossword clue in Financial Times
B
A
T
S
M
A
N
More clues leading to the result BATSMAN
- Crazy article about married cricketer
- Superhero imprisoning last of villains: he doesn’t want to get out
- Superhero grabs small chap a bouncer might hit
- Shilling pocketed by superhero, might one be on strike?
- Section held by friend of Robin Cook maybe?
- Personal attendant pressing whites, finally, for Bradman, say
- Fellow who is in society needing personal servant around
- Go over to fellow player
- Hero filmed tackling last of defenders, player collecting a knock
- Cave-dweller keeping second chap in or out?
Buddy explains!

The straight part
We know that "Fellow who is in" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fellow who is in = batsman.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 BATSMAN mean?
BATSMAN noun- A player of the batting side now on the field.
- The player now receiving strike; the striker.
- Any player selected for his or her team principally to bat, as opposed to a bowler.
- Any of the above senses, restricted to male players.
- (now rare) A hitter.