Crossword Genius

Centre of administration makes money (7)

Ross

I believe the answer is:

capital

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'centre' is the definition.
(I know that capital is a type of centre)

'administration makes money' is the wordplay.
'administration makes' becomes 'capita' (I can't explain this - if you can you should believe this answer much more).
'money' becomes 'l' (L can mean 'pounds').
'capita'+'l'='CAPITAL'

'of' is the link.

Can you help me to learn more?

(Other definitions for capital that I've seen before include "Finances" , "Block" , "Excellent - assets - first city" , "It's excellent in the big city" , "Finance - excellent!" .)

I've seen this clue in The Daily Express.
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