Crossword Genius

Previously good and eager (4)

Ross

I believe the answer is:

agog

'eager' is the definition.
(thesaurus)

'previously good' is the wordplay.
'previously' becomes 'ago' (I've seen this before).
'good' becomes 'g' (abbreviation).
'ago'+'g'='AGOG'

'and' is the link.

(Other definitions for agog that I've seen before include "In state of wide-eyed expectancy" , "Eager - in suspense" , "Wide-eyed and surprised" , "Enthralled" , "Eagerly expectant" .)

I've seen this clue in The Telegraph.
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