Hi George,
Others have made good points. I'll elaborate a bit with my thoughts.
I see the image is from the movie 'London has Fallen'. The image you posted is not very high resoluion and the flame covers a large area. This would make it difficult and time consuming to restore and the end result may not even look accurate. If your aim is to get the clock view without the flame, the best approach is to find another image of Big Ben and then distort warp/perspective) to get it close to the view you have.
If you're looking to learn about how to remove unwanted parts of an image, I'd suggest you look up the clone tool and content aware fill.
If there is something else you'd like to achieve/learn, let us know. Happy to advise or point you to good resources.
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