The most common and most likely answer to this crossword clue is the 6 plus 8 letter word PRINCE CHARMING
I've seen this crossword clue in The Guardian
P
R
I
N
C
E
C
H
A
R
M
I
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G
More clues leading to the result PRINCE CHARMING
- Mr Right? Chancer and pig in Mr Wrong!
- Dreamboat preparing to hug dissolute chancer
- Royal dynasty replacing the French kisser in a rescue act
- , 4 Crimping her can upset her dreamboat
- Frog once found pincer movement by crab’s head pernicious
- Pair in church marching around — he the ideal groom?
- Suitable man from wings to pour hot tea over porcelain, after Church
- . Pair in church marching around for ideal suitor
- 9a & 10.
- Cinders swept up by this rake?
Buddy explains!
The straight part
We know that "Frog once" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case frog once = prince charming.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.