Capers perhaps in creamy dish, in book put on line (10)
I believe the answer is:
tomfoolery
'line' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'capers perhaps in creamy dish in book put on' is the wordplay.
I cannot really understand how this works, but
'on' could be 'to' and 'to' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for tomfoolery that I've seen before include "Nonsense" , "Shenanigans" , "hanky-panky" , "Acting stupidly" , "Craziness" .)