Bad time of year to make babies? (9)
I believe the answer is:
offspring
'babies?' is the definition.
'bad time of year' is the wordplay.
'bad' becomes 'off' (I've seen this before).
'time of year' becomes 'spring' (spring is a kind of time of year).
'off'+'spring'='OFFSPRING'
'to make' acts as a link.
(Other definitions for offspring that I've seen before include "Result" , "seed" , "Child" , "Children, issue" , "Progeny" .)