Babies make a mess (6)

I believe the answer is:

litter

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'make a mess' is the definition.
(I've seen this in another clue)

I cannot understand how the remainder of the clue works.

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(Other definitions for litter that I've seen before include "Sow's young" , "Trash left lying about" , "New-born animals" , "that you may see in pigsty?" , "Rubbish - baby animals" .)

I've seen this clue in The Telegraph.

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