Endlessly Karl Benz invented, unrestrained by convention (6)

I believe the answer is:

brazen

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'endlessly karl benz invented unrestrained by convention' is the definition.
I can't tell whether this definition defines the answer.

'endlessly karl benz invented' is the wordplay.
'endlessly' indicates the central letters (the ends of the words are removed).
'invented' is an anagram indicator.
The centre of 'karl' is 'ar'.
'ar'+'benz'='arbenz'
'arbenz' with letters rearranged gives 'BRAZEN'.

Can you help me to learn more?

(Other definitions for brazen that I've seen before include "Impudent, shameless" , "Bold-faced" , "Shameless (impudence)" , "Shameless and bold - resembling brass" , "Brassy and impudent." .)

I've seen this clue in The Guardian.

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