Answer: gummed

AnswerCrossword Clue
GUMMED... up the works (ruined everything)
GUMMEDLike some flaps
GUMMEDLike some tape
GUMMEDClogged
gummedto smear, stick together, or clog with gum
gummedchewing gum
gummedGUM, to smear with gum (a sticky substance)
gummedsticky substance exuded from certain trees