One informally educated managed to do something on vehicle (10)
I believe the answer is:
Here is my best explanation:
'one informally educated' is the definition.
'managed to do something on vehicle' is the wordplay.
'managed' becomes 'did' ('do' can mean 'manage' as in 'do without').
'to' is a charade indicator (letters next to each other).
'do something' becomes 'act' (I've seen this before).
'on' means one lot of letters go next to another.
'vehicle' becomes 'auto' (auto is a kind of vehicle**).
'did'+'act' is 'didact'.
'didact' put after 'auto' is 'AUTODIDACT'.
(Other definitions for autodidact that I've seen before include "self-taught person", "learner without instructor", "one not needing coach", "Someone self-taught", "Self-educator", "I skipped school", "Self-taught person", "Self-reliant learner", "person who taught himself" and "For one not needing instructor".)