Immoral woman, no good, making a point (5)
I believe the answer is:
prong
'a point' is the definition.
(thesaurus)
'immoral woman no good' is the wordplay.
'immoral woman' becomes 'pro' (pro can mean a prostitute).
'no' becomes 'n' (common abbreviation).
'good' becomes 'g' (abbreviation).
'pro'+'n'+'g'='PRONG'
'making' acts as a link.
(Other definitions for prong that I've seen before include "Fork's point" , "branch" , "Tooth" , "Tine of a fork" , "Pointed end of fork" .)