The most common and most likely answer to this crossword clue is the 5 letter word SPREE
I've seen this crossword clue in Financial Times
S
P
R
E
E
More clues leading to the result SPREE
- One running through Berlin in binge
- Observe pair immersed in that European river
- Fling? Witness pair inside
- Inquire about present in this paraffle fae the future wifie?
- Pair caught by witness in drunken frolic, maybe
- Orgy superseded on a regular basis
- Merry outing on German river
- Consider including priest in a night on the razzle?
- Peers involved in bout of self-indulgence
- Jag regularly parked in Home Counties
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.
What does SPREE mean?
SPREE noun- A merry frolic; especially, a drinking frolic.
- Uninhibited activity.
- To engage in a spree.