Digging on road regularly turned problem for uninformed person (9)

I believe the answer is:

ignoramus

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'uninformed person' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe you can see an association between them that I don't see?

'digging on road regularly turned problem' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'turned' is a reversal indicator.
'problem' becomes 'sum' (as in a mathematical problem).
'digging'+'on'+'road'='diggingonroad'
The alternating letters of 'diggingonroad' are 'ignora'.
'sum' reversed gives 'mus'.
'ignora'+'mus'='IGNORAMUS'

'for' acts as a link.

Can you help me to learn more?

(Other definitions for ignoramus that I've seen before include "Simpleton" , "Ignorant person" , "Stupid person" , "One who knows nothing" , "One is not intelligent" .)

I've seen this clue in The Telegraph.

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