the clone will just continue to flower AND attempt to regrow roots..stoping the feed to the bud.
i could only see this being really benificial if its a bushy plant and you cut off/clone the bottom branches not getting enough light early on as soon as it shows sex, and put it in a fast proven cloner. might get more bang for your bush. but those branches might of made more bud on the plant without having to divert energy for a week since these plants only have a lifespan of like... 8 weeks right?
just an idea.. i plan on doing a bunch of autoflower outside this spring