The phrase "a key support of" is correct and usable in written English.
It can be used to indicate an important element or factor that provides assistance or backing to something.
Example: "The new policy serves as a key support of our efforts to improve employee satisfaction."
Alternatives: "a crucial element of" or "an essential component of".
The framework also allows the welfare system to be designated as a key support of life course and everyday practices.
Fears that the US Federal Reserve would continue cutting its $75bn a month bond buying programme, a key support of markets in recent months, were outweighed by the positive economic outlook.
Voices could be heard taunting him with cries of "Muqtada, Muqtada, Muqtada," referring to radical anti-American cleric Muqtada al-Sadr, the leader of the Shiite Mahdi Army militia and a key support of Prime Minister Nouri al-Maliki.
Ontologies are a key support to provide a shared understanding of knowledge domains.
A key supporting strategy of CDC GAP was to build human capacity and strengthen the existing health institutions to provide the needed leadership in a sustainable way.
Our organization is further enhanced by the formation of an Advisory Board of key support players who will give guidance and insight.
Red is scene-stealing, so I give it a low-key support act of flicky black eyeliner and curled, blackest lashes.
The fact that so many people find themselves with rising incomes and a rising standard of living is a key source of support.
El Alto residents then became a key source of support for the leftist president, Evo Morales, supporting him overwhelmingly when he was elected in 2005 and again in 2009.
Peer-based support, an essential component of educational outreach, was identified by PALM PLUS participants as a key source of support and motivation.
The elections are a key test of support for reform and for President Hassan Rouhani.
