On appeal from a federal court's ruling on a motion to suppress evidence, what is the test for reversing a finding of "clear error"?

"On appeal from a district court's ruling on a motion to suppress evidence, we review legal conclusions de novo and findings of fact for clear error." United States v. Bershchansky, 788 F.3d 102, 108 (2d Cir. 2015) (internal quotation marks omitted).¹ Reversal for clear error is appropriate if after reviewing the record we are "left with the definite and firm conviction that a mistake has been committed." Id. at 110. "We pay special deference to the district court's factual determinations going to witness credibility." Id. at 108 (internal quotation marks omitted).