The most common and most likely answer to this crossword clue is the 4 letter word CHIT
I've seen this crossword clue in The Times
C
H
I
T
More clues leading to the result CHIT
- Cold suddenly affected pert young woman
- Short note: check it
- Impudent youngster, Conservative success
- Tom gets to grips with problem conversation
- Husband long constrained by spiteful woman’s gossip
- Note success after first from Cambridge
- Problem, queen possibly admits, is gossip
- Short note from young woman
- Bill‘s child
- Bill joined college bash
Buddy explains!

The straight part
We know that "pert young woman" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case pert young woman = chit.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 CHIT mean?
CHIT noun- A child or babe; a young, small, or insignificant person or animal.
- A pert or sassy young person, especially a young woman.
- The embryonic growing bud of a plant
- An excrescence on the body, as a wart or a pimple.
- To sprout; to shoot, as a seed or plant.
- To damage the outer layers of a seed such as Lupinus or Sophora to assist germination.
- To initiate sprouting of tubers, such as potatoes, by placing them in special environment, before planting into the soil.
- A small sheet or scrap of paper with a hand-written note as a reminder or personal message.
- A voucher or token coin used in payrolls under the truck system; scrip.
- A small sheet of paper on which is written a prescription to be filled; a scrip.
- A smaller cardboard counter generally used not to directly represent something but for another, more transient, purpose such as tracking or randomization.
- A signed voucher or memorandum of a small debt, as for food and drinks at a club.
- A debt or favor owed in return for a prior loan or favor granted, especially a political favor.
- A small tool used in cleaving laths. Compare: froe.
- Shit.
- Shit.