وأما المفسر: فهو ما ظهر المراد به من اللفظ ببيان من قبل المتكلم بحيث لا يبقى معه احتمال التأويل والتخصيص.
Mufassar is wording clarified by the speaker such that the relevant possibilities of reinterpretation and specification no longer remain.
A naṣṣ expresses its intended point strongly, though certain recognized alternatives may still be considered. A mufassar contains additional explanation that closes those alternatives, whether through an emphatic term or an explicit qualifier.
The classification requires clarification that actually removes ambiguity, rather than mere rhetorical intensity.