Is it permissible to work as a guard in a market that contains a shop selling immodest women's clothing?

There is no objection to working as a guard in a market that contains a shop selling forbidden clothing, because this shop is not primarily intended for guarding; rather, it is subordinate to the permissible shops. That which is subordinate is excused, while that which is intended is not, as in the sale of the offspring of a camel while it is still in the womb, which is permissible as it is subordinate to its mother, and the fruit of a date palm before its ripeness becomes apparent, which is permissible as it is subordinate to its origin.