The most common and most likely answer to this crossword clue is the 8 letter word PREHUMAN
P
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The straight part
We know that "neanderthals perhaps" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case neanderthals perhaps = prehuman.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 PREHUMAN mean?
PREHUMAN noun- One of the human-like creatures prior to Homo sapiens.
- Preceding the advent of modern humanity, Homo sapiens