Nonsense children are always prepared to swallow (5)
I believe the answer is:
fudge
'nonsense' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for fudge that I've seen before include "Soft creamy sweet" , "Cook the books" , "Put together in makeshift way, like soft sweet" , "Soft toffee" , "Sweet - unsatisfactory compromise" .)