Extrovert son's expenditure (9)

I believe the answer is:

outgoings

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

'extrovert son's' is the wordplay.
'extrovert' becomes 'outgoing' (I've seen this before).
'outgoing'+'s'='OUTGOINGS'

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

I've seen this clue in The Telegraph.

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