The most common and most likely answer to this crossword clue is the 4 letter word GOGO
G
O
G
O
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 GOGO mean?
GOGO noun- An elasticated hair band.
- Grandmother; elderly woman.