Ten to one a German quartet has this name! (6)
I believe the answer is:
xavier
'this name' is the definition.
The definition suggests a singular noun which matches the answer.
'ten to one a german quartet' is the wordplay.
'ten' becomes 'X' (Roman numeral).
'to one a' becomes 'a'.
'german quartet' becomes 'vier' (German for 4).
'x'+'a'+'vier'='XAVIER'
'has' is the link.
Can you help me to learn more?
(Other definitions for xavier that I've seen before include "St Francis ---, Apostle of the Indies" , "St Francis -, sixteenth century Spanish Jesuit missionary" , "St Francis . . . . . ., founder Jesuit" , "St Francis ...... helped found the Jesuits" , "Catholic missionary" .)