Crossword Genius

Bighead caught by copper around bar (6,4)

Ross

I believe the answer is:

clever dick

I'm a little stuck... Click here to teach me more about this clue!

'bighead' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see an association between them that I don't see?

'caught by copper around bar' is the wordplay.
I cannot really understand how this works, but
'caught' could be 'c' (cricket abbreviation) and 'c' is found in the answer.
'copper' could be 'di' (detective inspector, type of copper) and 'di' is present in the answer.
'around' could be 'c' (abbreviation for 'circa') and 'c' is located in the answer.
'bar' could be 'lever' (lever is a kind of bar) and 'lever' is found in the answer.
A single letter 'k' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for clever dick that I've seen before include "Wise guy" , "The one with all the answers" , "Know-all" .)

I've seen this clue in The Times.
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