The most common and most likely answer to this crossword clue is the 5 plus 5 letter word MUMBO JUMBO
I've seen this crossword clue in Independent
M
U
M
B
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J
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M
B
O
More clues leading to the result MUMBO JUMBO
- Male boss with this foolish ritual
- Mother elephant catching a whiff of human’s incomprehensible speech
- Nonsense being quiet on Boris Johnson’s round wobbly bum
- Silent elephant has body odour. Claptrap!
- Confusing words by mother to child endlessly on plane
- Two members of family, one failing to finish crossword? Nonsense
Buddy explains!
The straight part
We know that "incomprehensible speech" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case incomprehensible speech = mumbo jumbo.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 MUMBO JUMBO mean?
MUMBO JUMBO noun- A deity or other supernatural being said to have been worshipped by certain West African peoples; an idol.
- Any object of superstition; religious words and/or actions which are seen as superstitious or fraudulent.
- (by extension) Any confusing or meaningless speech; nonsense, gibberish.