Eager leader carved out of hunk of marble? (4)
I believe the answer is:
avid
'eager' is the definition.
(synonyms)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for avid that I've seen before include "Mad for diva" , "Showing a very keen interest in something" , "Greedily eager" , "Keen, enthusiastic" , "Greedy or eagerly desirous" .)