Stuck for over a week. Spent numerous boosters, played this level hundreds of times. Tried everything, can't beat this level. Going to try Angry Birds for a while. I give up for now on Candy Crush.
It's a booster level. Use the check mark booster and you shall pass. King gives away a LOT of free boosters so you have to give some up for this level.
Keep at it. I estimate this to be medium difficulty. after about 20 tries I managed to get 3 clocks, then used two hammers to get the 4th and then 2 switches to get the final clock. Using boosters to start doesn't help. I have probably gotten over 400 boosters for free. This level you have to give a few back.