Some characters cannot tolerate popular name in Germany (4)

I believe the answer is:

otto

I'm a little stuck... Click here to teach me more about this clue!

'popular name in germany' is the definition.
I can't tell whether this defines the answer.

'some characters cannot tolerate' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'OTTO' is hidden in the letters of 'characters cannot tolerate'.

Can you help me to learn more?

(Other definitions for otto that I've seen before include "German king" , "Male German name - a palindrome" , "Producer of engines" , "Preminger or von Bismark?" , "Palindromic German boy's name" .)

I've seen this clue in the Irish Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.