The phrase "avid champion" is correct and usable in written English.
It can be used to describe someone who is very enthusiastic and supportive of a particular cause, activity, or person.
Example: "She is an avid champion of environmental conservation, always advocating for sustainable practices."
Alternatives: "enthusiastic supporter" or "passionate advocate.".
An avid champion of Indian art, he donated much of his collection to the Harvard University Art Museums.
Throughout her life she was an avid champion of the right for human dignity amongst all people.
American journalist who, served as the editor of The Wall Street Journal's editorial page for three of his nearly four decades with that paper and in that post was an avid champion of supply-side economics and increased defense spending.
He has been an avid champion for customers and has made a focus on fans central to the StubHub DNA.
Szigeti was an avid champion of new music, and frequently planned his recitals to include new or little-known works alongside the classics.
It's hard to imagine that Miranda, who has spent his whole career as an avid champion of Broadway inclusion, would be thrilled about his show's awesome imbalance of wealth and popularity.
As a former chair of the Holocaust Center, Owen was an avid supporter of Holocaust education and a dedicated champion of human rights.
Like his father (who founded the gallery on Via Tornabuoni in Florence in 1981), and his grandfather (an upholsterer who in the 1940s recovered artists' tattered furniture for payment in kind), Mr. Casamonti has been an avid collector and champion of the conceptualists' work for decades.
It is also home to an open-air funeral pyre, which was built by the Crestone End-of-Life Project, a small but avid group that champions natural funerals.
Friedman was a proud yo-yo champion and avid golfer, and recently retired from his regular duties at JAKKS Pacific to spend more time with his family.
Moonves has always championed star value, but avid agents would hit the wall if their appetites became too voracious.
