Answer: inrome

AnswerCrossword Clue
INROMEVisiting Trevi Fountain, say
INROME"When .., do as . . ."
INROMEWhen ..., do as the Romans do.
INROME"When ... . . . "
INROMEWhere to conform
INROMEWhere to do what others do
INROMEWhere to do as others do
INROMEWhere to conform, per an expression
INROMEWhere to emulate the locals, it's said
INROMEWhen ... do as the . . .