When it comes to tall stories, this beats all! (10)
I believe the answer is:
skyscraper
'when it comes to tall stories this beats all' is the definition.
The definition suggests a singular noun which matches the answer.
This is all the clue.
Can you help me to learn more?
(Other definitions for skyscraper that I've seen before include "multi-storey building" , "UN HQ building, say" , "Lofty city building" , "Very high building" , "structure" .)