I'm surprised editor accepts European that's sought attention (6)

I believe the answer is:

cooeed

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'sought attention' is the definition.
The definition suggests a past participle verb which matches the answer.

'i'm surprised editor accepts european' is the wordplay.
'i'm surprised' becomes 'coo' (exclamation of surprise).
'editor' becomes 'ed' (abbreviation).
'accepts' means one lot of letters goes inside another.
'european' becomes 'e' (abbreviation e.g. EU).
'ed' going around 'e' is 'eed'.
'coo'+'eed'='COOEED'

'that's' acts as a link.

Can you help me to learn more?

(Another definition for cooeed that I've seen is " called to attract attention".)

I've seen this clue in The Times.

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