Crossword Genius

Come to understand thread about European Union (4,2)

Ross

I believe the answer is:

wise up

'come to understand' is the definition.

'thread about european union' is the wordplay.
'thread' becomes 'wisp'.
'about' indicates putting letters inside.
'european union' becomes 'eu'.
'wisp' enclosing 'eu' is 'WISE UP'.

(Other definitions for wise up that I've seen before include "Gain awareness" , "Find out" .)

I've seen this clue in The Guardian.
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