Screwing procedure to make babies (9)
I believe the answer is:
reproduce
'make babies' is the definition.
'reproduce' can be an answer for 'make' (reproducing is a kind of making). I am not certain of the 'babies' bit.
'screwing procedure' is the wordplay.
'screwing' indicates anagramming the letters.
'procedure' is an anagram of 'REPRODUCE'.
'to' is the link.
Can you help me to learn more?
(Other definitions for reproduce that I've seen before include "Create offspring" , "Make a child" , "achieve propagation" , "Make a copy of (something)" , "Duplicate" .)