Look over - EXAMINE
Blue character from Yellow Submarie - MEANIE
Investigation - INQUEST
Dress' sparkler - SEQUIN
On ___ (not by chance) - PURPOSE
Evening meal - SUPPER
Threw back together - REBUILT
Manservant - BUTLER
Exchange for a new part - REPLACE
Section of land - PARCEL
Old-style photograph - TINTYPE
Being - ENTITY
Leftover letters: L X T I O E P
Passcode: EXPLOIT