The most common and most likely answer to this crossword clue is the 8 letter word ABSURDER
I've seen this crossword clue in Financial Times
A
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Buddy explains!
The straight part
We know that "More senseless" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case more senseless = absurder.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 ABSURDER mean?
ABSURDER adjective- Contrary to reason or propriety; obviously and flatly opposed to manifest truth; inconsistent with the plain dictates of common sense; logically contradictory; nonsensical; ridiculous; silly.
- Inharmonious; dissonant.
- Having no rational or orderly relationship to people's lives; meaningless; lacking order or value.
- Dealing with absurdism.