you can clone from plant in flower, but a couple things...1st, It has to revert from flower to veg, dying in between...basically.

It will work, but bigger chance of hermie due to high stress reverting to veg.

Your optimum time for taking cutting is when a plant is at least a month old & a week or 2 before 12/12...clones take age of mother. one month old...does not mean from sprout. It means from 4-5 sets of nodes & seedling placed in veg, nutes added. Peace