The most common and most likely answer to this crossword clue is the 8 letter word STUPIDER
I've seen this crossword clue in Independent
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Buddy explains!
The straight part
We know that "Less intelligent" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case less intelligent = stupider.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 STUPIDER mean?
STUPIDER adjective- Lacking in intelligence or exhibiting the quality of having been done by someone lacking in intelligence.
- To the point of stupor.
- Characterized by or in a state of stupor; paralysed.
- Lacking sensation; inanimate; destitute of consciousness; insensate.
- Dulled in feeling or sensation; torpid
- Amazing.
- Darn, annoying.