Top part (4)
(Other definitions for crown that I've seen before include "sporting award" , "The sovereign" , "repair for damaged tooth" , "Monarch's headgear" , "Old five shilling piece" .)
(Other definitions for upper that I've seen before include "Higher in status" , "form of stimulant" , "Amphetamine pill" , "Higher-ranking" , "The higher of two, berths perhaps" .)
(Other definitions for head that I've seen before include "Leader; promontory" , "School boss" , "Chief; promontory" , "Be in charge of; (come to) crisis" , "See 12" .)