Piece of cake contains the pounds that tip the balance (6)
I believe the answer is:
clinch
'piece of cake contains the pounds that tip the balance' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe there's a link between them I don't understand?
'piece of cake contains the pounds' is the wordplay.
'piece of cake' becomes 'cinch' (both can mean something very easy).
'contains' means one lot of letters goes inside another.
'the pounds' becomes 'L' (L can represent the monetary pound).
'cinch' going around 'l' is 'CLINCH'.
Can you help me to learn more?
(Other definitions for clinch that I've seen before include "Tight (or amorous) embrace" , "Fasten securely or settle conclusively" , "Matthew ---; --- Schoenberg" , "Passionate embrace" , "make secure" .)