Crossword Genius

Charlie’s parking by Barbican perhaps after pulling over (5)

Ross

I believe the answer is:

twerp

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'over' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for twerp that I've seen before include "Pillock" , "In slang, a stupid or objectionable person" , "Twit" , "Silly-billy" , "Fool" .)

I've seen this clue in The Times.
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