Crossword Genius

Very enthusiastic about creating as unmarked asset (2,4,2,7)

Ross

I believe the answer is:

as keen as mustard

I'm a little stuck... Click here to teach me more about this clue!

'very enthusiastic about creating as unmarked asset' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'very enthusiastic about creating as unmarked asset' is the wordplay.
'as unmarked asset' anagrams to 'AS KEEN AS MUSTARD'.
Though, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for as keen as mustard that I've seen before include "very passionate?" , "anxious?" , "How dressing for dinner may make you" .)

I've seen this clue in the Sydney Morning Herald.
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