Yes, you CAN clone a flowering plant.
You can also re-veg a clone from a flowering plant. I know, I know, its a topic for hot debate, but I have had success doing it myself.
I also have proof.... Check 303's journal and see for yourself/
https://www.rollitup.org/grow-journals/192989-5-best-mindblowing-strains-day.html (scroll topost #303 or #312. You can see new roots growing)
Cloning is actually very simple to do. Infact, tomato plants that come in contact with the ground will start growing roots from the branch.... Its pretty cool!!!