Agreed European parting leaves nothing (5,2)

I believe the answer is:

quite so

'agreed' is the definition.
(both can be said to indicate agreement)

'european parting leaves nothing' is the wordplay.
'european' becomes 'e' (abbreviation e.g. EU).
'parting' indicates putting letters inside.
'leaves' becomes 'quits' ('quit' can be a synonym of 'leave').
'nothing' becomes 'o' (looks like zero - 0).
'e' placed within 'quits' is 'quites'.
'quites'+'o'='QUITE SO'

(Another definition for quite so that I've seen is " Indeed".)

I've seen this clue in The Guardian.

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