There's no UCAS mechanism that works like that. A rejection is a decision on that application, not a flag that follows the applicant into Clearing. In Clearing the university looks at the same application again (personal statement, reference, and now actual grades), and if the course has places at the grades your DC got, an earlier rejection doesn't stop them making an offer. Admissions tutors can still decide either way, so if it matters, ring the department on results day and say plainly that it was a course they really wanted.
The more useful question is the one concertinacornflake and tardive are getting at, which is how to spend five choices. A few things that help.
The 2026 Clearing grades you've listed are a snapshot of one year. A course that went into Clearing at CCC one year can be full on results day the next, and the most popular courses often never appear in Clearing at all. Planning to get in through Clearing means relying on a vacancy that may not exist.
Many universities publish a typical offer but will make offers to applicants predicted a grade or so below it, especially where contextual offers apply. The way to find out is to read each course page for wording on contextual or reduced offers, or email admissions and ask directly. How they answer also tells you something about how they treat applicants.
A common spread is one or two aspirational choices (as tardive says), two around the predicted grades and one comfortably below. That way a rejection from an ambitious choice costs one slot rather than the whole application.
If all five come back without an offer, UCAS Extra lets an applicant add further choices one at a time before Clearing opens, so it isn't five strikes and out.
And if results day goes badly, a year out to reapply with grades in hand is a real option rather than a failure. Applying with achieved grades changes which courses are realistic, and a year spent working or volunteering gives them something concrete to write about in the new personal statement.
Y13 mocks are often a poor guide either way, so it may be worth waiting for the school's predicted grades before narrowing the list.