The most common and most likely answer to this crossword clue is the 3 plus 2 letter word HIT ON
I've seen this crossword clue in The Daily Telegraph
H
I
T
O
N
More clues leading to the result HIT ON
- Like an actress confronted by Weinstein: “sell-out to get working”?
- Discover Paris, maybe forget Lima
- Proposition discovered left out in hotel chain
- Strike ball heading for net or try a pass?
- Flirt greeting the fashionistas!
- Flirt with husband into swinging
- Discover Paris, say, avoiding Louvre at first
- Unexpectedly met with greeting — not returned
- Suddenly discover successful record playing
Buddy explains!

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.