I plead UK rules. "L" is a common Brit abbreviation for learner (all unqualified drivers have to have a big "L" sticker on their cars) and has been extended in crosswords to cover synonyms of "learner".
Like a ring can be "O" (that's not an abbreviation), a clergyman is "DD" (doctor of divinity), "RA" is a painter (Royal Academy) - not true abbreviations but commonly-accepted shorthand forms. So "Peculiar ring attached to vicar (3)" is a legit clue for "ODD"
I throw myself on the mercy of the noodle-meister. If found guilty I ask for 2362 other offences to be taken into consideration
Anyway, manxman understood it