Unfortunately one comes across one making savings (9)

I believe the answer is:

economies

'savings' is the definition.
('economy' can be a synonym of 'saving')

'unfortunately one comes across one' is the wordplay.
'unfortunately' indicates an anagram.
'across' indicates putting letters inside.
'one' becomes 'i' (Roman numeral).
'one'+'comes'='onecomes'
'onecomes' is an anagram of 'economes'.
'economes' placed around 'i' is 'ECONOMIES'.

'making' acts as a link.

(Another definition for economies that I've seen is " savings".)

I've seen this clue in The Telegraph.

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