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Challenge to make English shingle or German manger? (6-7)

Ross

I believe the answer is:

tongue-twister

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

'challenge' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'to make english shingle or german manger?' is the wordplay.
I cannot really understand how this works, but
'to' is found in the answer.
'english' could be 'e' (abbreviation) and 'e' is found within the answer.
'german' could be 'gut' (I have seen 'good German' mean 'gut' so perhaps 'german' could also mean 'gut') and 'gut' is located in the remaining letters.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for tongue-twister that I've seen before include "Peter Piper picked a peck of pickled pepper, for instance" , ""I wish to wash my Irish wristwatch", perhaps" , "Phrase that is difficult to say properly" , "It's hard to say!" , "Sequence of words difficult to say" .)

I've seen this clue in The Telegraph.
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