The most common and most likely answer to this crossword clue is the 5 letter word TITCH
I've seen this crossword clue in The Daily Telegraph
T
I
T
C
H
More clues leading to the result TITCH
- Problem getting new start for small person
- Little person – bit of a pain after short time
- Songbird perching on top of church, a little one
- Little one originally trained in technology can’t handle
- Someone short of time heading off from sports field
- Little chap has temperature and irritation
- Small child attached to nipple, a tiddler
- Tour leader getting skin problem from shrimp
- Little chap beginning to thrive before long
- One’s very short but ultimately long
Buddy explains!

The straight part
We know that "Little chap" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case little chap = titch.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 TITCH mean?
TITCH noun- A very small person; a small child.
- A small amount of something.
- Eye dialect spelling of touch
- To show (someone) the way; to guide, conduct; to point, indicate.
- (ditransitive) To pass on knowledge to.
- To pass on knowledge, especially as one's profession; to act as a teacher.
- (ditransitive) To cause to learn or understand.
- (ditransitive) To cause to know the disagreeable consequences of some action.