The most common and most likely answer to this crossword clue is the 5 letter word ROMPS
R
O
M
P
S
More clues leading to the result ROMPS
Buddy explains!

The straight part
We know that "Frolics" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case frolics = romps.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 ROMPS mean?
ROMPS noun- Someone who romps; especially, a girl or young woman who indulges in boisterous play; a tomboy.
- A period of boisterous play, a frolic; now especially, a bout of sexual activity, especially when illicit.
- An enjoyable, fast-paced but essentially inconsequential film, play, or other piece of entertainment.
- A decisive victory; a game, match etc. which is won easily.
- To play about roughly, energetically or boisterously.
- (Often used with down) To press forcefully, to encourage vehemently, to oppress.
- To win easily.
- To engage in playful or boisterous sex.