Answer: inrome

AnswerCrossword Clue
INROME

Visiting Trevi Fountain, say

INROME

"When .., do as . . ."

INROME

When ..., do as the Romans do.

INROME
"When ... . . . "
INROME
Where 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 . . .