Answer: prowler

AnswerCrossword Clue
PROWLERSneak thief
PROWLERSecond-story man
PROWLERSneak who's up to no good
PROWLERSneaky sort
PROWLERCat burglar
PROWLERMasked man, maybe
PROWLEROne up to no good
PROWLERStealthy one
PROWLERPotential second-story man
PROWLERAlarm tripper
prowlerA person who moves stealthily around or loiters near a place with a view to committing a crime, esp. burglary
prowlerone that prowls (to move about stealthily)