Periodic suppression of kidnapping and — imminently — dropping litter (2,3)
I believe the answer is:
in pig
'periodic suppression of kidnapping' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.
'and imminently dropping litter' is the wordplay.
I cannot quite see how this works, but
'and' could be 'n' (common abbreviation for 'and') and 'n' is found within the answer.
'litter' could be 'pig' (pigging is a kind of littering) and 'pig' is found in the answer.
A single letter 'i' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for in pig that I've seen before include "Carrying litter" , "Expecting" .)