What do you mean by "clean bulking"?
Do you mean "Bulking up by eating 'clean' foods", or "only putting on 'clean bulk' (muscle)"?
If it's number 1, it requires eating more food than you might feel comfortable with, because 'clean' food has less calories than something like, say, chocolate cake or a greasy hamburger.
If it's number 2, this is a long, hard, tough and practically impossible journey. "Bulking" means getting fatter (and, hopefully, more muscly). "Clean bulking", in this sense, is pretty much a myth.