The most common and most likely answer to this crossword clue is the 5 letter word PUPIL
I've seen this crossword clue in The Daily Telegraph
P
U
P
I
L
More clues leading to the result PUPIL
- One learning this is part of the eye
- Student, bit of a looker?
- Prep round opening of water pump
- Student held back by slip-ups
- Eye part one studies
- Student at college interrupting short nap
- Young dog accompanying the Italian student
- Student‘s dog seen with girl regularly
- Schoolchild's young dog left lying under one
- Schoolboy error, detaching back of harness when climbing
Buddy explains!

The straight part
We know that "student" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case student = pupil.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 PUPIL mean?
PUPIL noun- A learner under the supervision of a teacher or professor.
- An orphan who is a minor and under the protection of the state.
- The hole in the middle of the iris of the eye, through which light passes to be focused on the retina.
- The central dark part of an ocellated spot.