The most common and most likely answer to this crossword clue is the 5 letter word PRINK
P
R
I
N
K
More clues leading to the result PRINK
Buddy explains!

The straight part
We know that "flirt" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case flirt = prink.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 PRINK mean?
PRINK verb- To give a wink; to wink.
- The act of adjusting dress or appearance; a sprucing up
- To look, gaze.
- To dress finely, primp, preen, spruce up.
- To strut, put on pompous airs, be pretentious.