Mr. ___ (4)
(Other definitions for hyde that I've seen before include "doctor turned into during work" , "Jekyll's alter ego" , "Manchester town, London park" , "... the latter side of [EVIL] nature" , "See 15" .)
(Other definitions for mom that I've seen before include "'US mother, informally (3)'" , "US mother, in short" , "A familiar American mother" .)