Crossword Clue:

Banking is an important part of it

AnswerCrossword Clue
POOLBanking is an important part of it
FACEBOOKWalls are an important part of it
OPERAAn aria is part of it
TRIGSubject in which sin is an important topic?
PROPImportant part of an airplane.
UNTOUCHABLESPart of an important global problem.