Answer: gapped

AnswerCrossword Clue
GAPPED

Set a spark plug

GAPPED

Adjusted, as a spark plug

GAPPED

Like some teeth

GAPPED
Made an opening in.
GAPPED
Breached.
GAPPEDMade a breach in
GAPPEDLike Letterman's front teeth
GAPPEDLike some front teeth
GAPPEDLike Lauren Hutton's front teeth
GAPPEDLike Michael Strahan's teeth