The phrase "a clear cause of" is correct and usable in written English.
It can be used when discussing the reason or factor that leads to a particular outcome or effect.
Example: "The study identified a clear cause of the decline in bee populations, linking it to pesticide use."
Alternatives: "an evident reason for" or "a distinct factor in".
A post-mortem that afternoon was unable to establish a clear cause of death for Eva.
Cocaine should be considered as a cause of ESRD in patients without a clear cause of renal failure.
Video of the incident, which is widely available on the Web, does not indicate a clear cause of the altercation, though witnesses said a fan tried to grab her.
So far, they've only been able to collect tissue samples from one of the 30 carcasses -- many of which have been unretrievable, or too badly decomposed to study -- and even that sample didn't present a clear cause of death.
The only forensic specialists to have examined all of the bodies found at Dachny said in an interview that they were so ill-equipped to conduct professional examinations that in all but one case they could not state a clear cause of death, and that their examinations would never stand up in court if the killers were ever brought to justice.
Referral is a good idea even if an autopsy was never performed, or if the postmortem exam didn't find a clear cause of death, Johns Hopkins experts say.
No one in the establishment is prepared to make the connection between these dancers' lack of confidence and their schooling experience, but to many observers it's a clear case of cause and effect.
It is a comforting interpretation, because it serves as a clear-cut cause of good and evil, an issue that Western do-gooders can turn to when they feel the need to strike a moral pose.
Still, "a clear case of geothermal development causing a hot spring to dry up has not occurred in Japan," Mr. Sakaguchi added.
One explanation of this finding may be that a clear somatic cause of the patient's problem makes it easier for the GP to evaluate both the patient's functional impairments and potential and hence, in some cases, to abstain from sick listing the patient.
