"clearly discern" is a correct phrase that can be used in written English.
It is most often used to refer to the ability to easily identify or determine something, usually by sight or by sense. Example sentence: After examining the data carefully, we were able to clearly discern a pattern.
Mr. Flesh laid it flat and made it big enough so that home viewers could clearly discern its markings.
If we consider Euclidean geometry we clearly discern that it refers to the laws regulating the positions of rigid bodies.
He was replaced on the floor by the Senate chaplain, who, noting that the chamber had "reverberated with a marathon of speaking," delivered a prayer asking God to help the members "to clearly discern right from wrong".
This is a situation in which we have identified specific votes, many of which were agreed by the District Court were votes in which you could clearly discern the voter's intent.
Every spring some of the foundation's flowers bloom at Tribeca in the form of staged readings of screenplays under development, and it is in these readings and the discussions that follow that one can perhaps most clearly discern the shape of the cultural beast still fighting to be born.
As they gorge on junk food and vapid women, administer a well-being quiz (sample question: "Are you ever aware of your own heartbeat?"), and become in-house counsel for a Colorado mogul, one can clearly discern the author attempting to skewer the consumerism and the spiritual emptiness of contemporary society.
And this is where Mr. Lucas's hand can be most clearly discerned, in a good way.
As a reluctant celebrity who admits to visiting two therapists every week, Eisenberg is clearly discerning about his neuroses.
Some scientists who have long doubted that a human influence could be clearly discerned in the Arctic's changing climate now agree that the trend is hard to ascribe to anything else.
Distinctive colorimetric transition of LBD from colorless to light yellow was also clearly discerned.
As the potential was increased, the peak(s) ascribed to NO ads) gained in intensity and new features associated with NO2− ads) and NO2−(sol) were clearly discerned.
