Crossword Genius

Soon see, appearing in a green confection (3,4)

Ross

I believe the answer is:

ere long

'soon' is the definition.
(thesaurus)

'see appearing in a green confection' is the wordplay.
'see' becomes 'lo' ('lo' is an archaic exclamation meaning 'look!').
'appearing in' means one lot of letters goes inside another.
'confection' is an anagram indicator (I've seen this in other clues).
'green' anagrammed gives 'ereng'.
'lo' placed inside 'ereng' is 'ERE LONG'.

I've seen this clue in the Evening Standard.
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