The Count - boss and idiot (8)

I believe the answer is:

addition

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'the count boss' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'and idiot' is the wordplay.
'and idiot' can be anagrammed to 'ADDITION'.
Though, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for addition that I've seen before include "Reckoning" , "Supplement" , "Increment" , "Mathematical procedure" , "Process of summation" .)

I've seen this clue in The Irish Times.

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