The most common and most likely answer to this crossword clue is the 4 letter word HOPS
I've seen this crossword clue in Independent
H
O
P
S
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 HOPS mean?
HOPS noun- A short jump.
- A jump on one leg.
- A short journey, especially in the case of air travel, one that take place on private plane.
- A bounce, especially from the ground, of a thrown or batted ball.
- A dance; a gathering for the purpose of dancing.
- The sending of a data packet from one host to another as part of its overall journey.
- To jump a short distance.
- To jump on one foot.
- To be in state of energetic activity.
- To suddenly take a mode of transportation that one does not drive oneself, often surreptitiously.
- To jump onto, or over
- (usually in combination) To move frequently from one place or situation to another similar one.
- To walk lame; to limp.
- To dance.
- The plant (Humulus lupulus) from whose flowers, beer or ale is brewed.
- (usually in the plural) The flowers of the hop plant, dried and used to brew beer etc.
- Opium, or some other narcotic drug.
- The fruit of the dog rose; a hip.
- To impregnate with hops, especially to add hops as a flavouring agent during the production of beer
- To gather hops.