Crossword Genius

Expenditure of friendly society (9)

Ross

I believe the answer is:

outgoings

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

'expenditure' is the definition.
(I've seen this before)

'friendly society' is the wordplay.
I cannot quite see how this works, but
'society' could be 's' (common abbreviation in names of organisations) and 's' is located in the answer.
The remaining letters 'outgoing' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'of' is the link.

Can you help me to learn more?

(Other definitions for outgoings that I've seen before include "Regular expenditure" , "expeditions" , "Expenses" .)

I've seen this clue in The Guardian.
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