Did he make his name by getting in a rut? (6)

I believe the answer is:
rupert
'did he make his name' is the definition.
The definition suggests a singular noun which matches the answer.
'getting in a rut?' is the wordplay.
'getting in' means one lot of letters goes inside another.
'a' becomes 'per' (eg 'one a day' means 'one per day').
'per' going within 'rut' is 'RUPERT'.
'by' is the link.
Can you help me to learn more?
(Other definitions for rupert that I've seen before include "Poet who wrote of ..." , "Mary Tourtel's bear" , "Prince" , "Comic strip bear" , "Boy" .)
