Extrovert Swede’s capital expenditure (9)
I believe the answer is:
outgoings
'expenditure' is the definition.
(I've seen this before)
'extrovert swede's capital' is the wordplay.
'extrovert' becomes 'outgoing' (both can mean social).
'capital' suggests taking the first letters.
The first letter of 'swedes' is 's'.
'outgoing'+'s'='OUTGOINGS'
(Other definitions for outgoings that I've seen before include "Regular expenditure" , "Expenses" , "expeditions" .)