The most common and most likely answer to this crossword clue is the 5 letter word COOEE
I've seen this crossword clue in The Guardian
C
O
O
E
E
Buddy explains!
The straight part
We know that "over here!" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case over here! = cooee.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 COOEE mean?
COOEE noun- A long, loud call used to attract attention when at a distance, mainly done in the Australian bush.
- (with "within") A short distance; hailing distance.
- To make such a call.
- Used to attract someone's attention.