The most common and most likely answer to this crossword clue is the 8 letter word SEABIRDS
I've seen this crossword clue in The Guardian
S
E
A
B
I
R
D
S
More clues leading to the result SEABIRDS
Buddy explains!

The straight part
We know that "Perhaps divers" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case perhaps divers = seabirds.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 SEABIRDS mean?
SEABIRDS noun- Any bird that spends most of its time in coastal waters or over the oceans.