The phrase "a main player in" is correct and usable in written English.
It can be used to describe someone or something that has a significant role or influence in a particular situation or context.
Example: "The company has become a main player in the renewable energy sector, leading the way in innovative solutions."
Alternatives: "a key player in" or "a major contributor to".
The hospital is a main player in the presence of the FSA.
Mr. Jang, 64, is widely seen as a main player in ensuring the transfer of power to the leader's son.
Deutsche Bank, Germany's financial flagship, is seen as a main player in any reshuffling of the European banking landscape.
The Securities and Exchange Commission proposed the crackdown as part of a broader effort to rein in the opaque derivatives business, a main player in the financial crisis.
"Here you have a main player in the war facing the truth," Florence Hartmann, spokeswoman for the prosecutor, told reporters after the plea.
A main player in the Hollywood session world of the 1960s, he co-wrote A Little Less Conversation for Presley and arranged These Boots Are Made for Walking for Nancy Sinatra.
Although the molecular mechanisms by which DR prolongs lifespan are poorly understood, the Target of Rapamycin Complex 1 (TORC1) signaling pathway that controls protein translation, autophagy and mitochondrial function, among other growth-related processes, is considered a main player mediating DR effects in diverse model organisms.
Media The Man Who Owns The News by Michael Wolff, Bodley Head, £20 Wolff's biography of Rupert Murdoch – written using 50 hours of taped interviews with the News Corp chairman – may be a profile of the main player in the dynasty, but Rupert's rise (and now possible fall) is interwoven with his family.
Saudi Arabia is the main player in a coalition supporting the Yemeni government against the Houthis in a war that has caused a humanitarian catastrophe.
But the male narrator of "Halloween" sounds suspiciously like the female lead of "Lockheed," who bears a pungent resemblance to the main player in "Chinatown in Three Parts".
The British Humanist Association (BHA), main player in a series of Freedom of Information requests on the issue, wanting to know the religious affiliation of applicants, said the decision was "a victory for transparency and democracy", although it was not clear on Tuesday whether Gove will appeal for a second time.
