Enthusiastic about being quick to get ahead (4,2)

I believe the answer is:
keen on
'enthusiastic about' is the definition.
(I've seen this in another clue)
'quick to get ahead' is the wordplay.
'quick' becomes 'keen' (I've seen this before).
'to get' says to put letters next to each other.
'ahead' becomes 'on' (synonyms).
'keen'+'on'='KEEN ON'
'being' is the link.
I've seen this clue in the Evening Standard.
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