Capital invested in Joan of Arc casually returned? (5)

I believe the answer is:

accra

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'capital' is the definition.
(capital of Ghana)

'invested in joan of arc casually returned?' is the wordplay.
'ACCRA' is hidden backwards in amongst the letters.
But, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for accra that I've seen before include "African port" , "Main city of Ghana" , "Largest city of Ghana" , "Capital of Ghana, African fritter" , "African city" .)

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