Minute Cryptic

Our definition here is 'Swimming group', and our answer will be a word for a group of swimmers.

This clue's indicators are 'cleared of', 'after', 'second', and 'evacuation?'. Two of these are deletion indicators that work in different ways. "cleared of" sits between two pieces of fodder and asks us to delete one from the other. 'evacuation' pairs with a selection indicator - in this case 'second' - to specify what to delete. And 'after' is a simple repositioning indicator - some fodder will appear after other fodder.

This clue's fodder is 'pool', 'pee', and 'such'. We'll use the letters of two of these, along with a short substitute for the other to construct our answer, as guided by the clue's indicator(s). Extra hint: for this clue, it helps to know how letters are spelled...