The phrase "a credible partner" is correct and usable in written English.
You can use it when referring to someone or an organization that is trustworthy and reliable in a partnership or collaboration context.
Example: "In order to succeed in this project, we need to find a credible partner who shares our values and vision."
Alternatives: "a trustworthy collaborator" or "a reliable associate".
He says the governing Palestinian Authority has not proved itself a credible partner for negotiations.
Most respondents (59%) endorsed the view that the Palestinians are not a credible partner in the peace process.
"He is sufficiently distanced from the United States to be a credible partner in the eyes of Pakistanis," she said.
The absence of a credible partner in the government of Afghanistan will continue to hamper America's economic and military effort.
Pulling out of these agencies would compromise America's ability to work as a credible partner and would diminish the administration's ability to protect American interests.
But no substantive negotiations are under way, and Mr. Sharon argues that the Palestinian leadership has not proved a credible partner in bilateral arrangements or talks.
That would be a huge setback for Mr. Karzai's shredded domestic credibility and for the American strategy in Afghanistan, which needs a minimally credible partner.
In the summer of 2004, a group of radical Lib Dem MPs and parliamentary candidates contributed to a collection of essays designed to drag their party to the centre ground and make it a grown-up, credible partner in a government by proposing greater choice and market solutions in public services.
Greece must, and will, transform itself into a competitive and credible partner in the international community.
Part of the problem is that counterinsurgency requires a credible local partner".
We heard for years how Israel earnestly desired a two-state solution if only there were a credible Palestinian partner.
