The phrase "a delusion for" is correct and usable in written English.
It can be used when discussing a false belief or misconception that someone holds regarding a particular subject or situation.
Example: "He has developed a delusion for the idea that he is invincible, despite the evidence to the contrary."
Alternatives: "a misconception about" or "a false belief regarding".
It's a delusion for politicians to think that biodiesel will solve climate change".
(Thus, ignoring the difference between an illusion and a delusion, for example, lends credence to the view that the objects of immediate perception are not physical objects but sense data).
The belief in the possibility of true purity might be a delusion for most voters, but it's a privilege of youth, the province of people for whom the thrill of theory hasn't yet given way to the comparative disappointment of practice.
The hope that we can claw our way up from our low station to someplace fancier is a delusion for most of us, according to this study.
If one's first premise is that religion must be a snare and a delusion, for instance, then it follows that Eliot becomes an enemy to be assaulted, rather than a pilgrim whose journal one may admire-even if one does not believe in the goal of that quest".
(Another clue: Cotard is the term for a delusion of people who believe that they are dead).
For many, a delusion of communication is preferable to a sad reality that their child may not have the requisite cognitive function to be communicative, and so FC continues to enjoy support in many quarters.
As a result of this accident (which was designed by a rival), the fallen man's performance became a delusion, and for 20 years he believed he was Emperor Enrico IV.
As Viktor Styazhkin reported, Snezhnevsky diagnosed a reformation delusion for every case when a patient "develops a new principle of human knowledge, drafts an academy of human happiness, and many other projects for the benefit of mankind".
After Quiet: The Power of Introverts in a World that Can't Stop Talking, which was, in Jon Ronson's description, "the Female Eunuch for anxious nerds", we need another book: Unembraceable You: The Pleasures of Disconnecting from an Online World Gone Nuts – a God Delusion for recovering geeks.
Treasury sources have warned it would be "a dangerous delusion" for Eurozone countries to backtrack on deficit cuts.
