Bad season for litter (9)
I believe the answer is:
offspring
'litter' is the definition.
(thesaurus)
'bad season' is the wordplay.
'bad' becomes 'off' (I've seen this before).
'season' becomes 'spring' (spring is a kind of season).
'off'+'spring'='OFFSPRING'
'for' is the link.
(Other definitions for offspring that I've seen before include "Child" , "seed" , "Progeny" , "Children, issue" , "Result" .)