Point in press release is not good. Has nothing in it (5)
I believe the answer is:
prong
'point' is the definition.
(I've seen this before)
'press release is not good has nothing in it' is the wordplay.
'press release' becomes 'pr' (public relations).
'is not good' becomes 'ng' (I can't justify this - if you can you should give a lot more credence to this answer).
'has nothing' becomes 'o' (I've seen this in other clues).
'in it' indicates putting letters inside.
'pr'+'ng'='prng'
'prng' enclosing 'o' is 'PRONG'.
'in' is the link.
Can you help me to learn more?
(Other definitions for prong that I've seen before include "Fork part" , "Tooth" , "Spike of fork etc" , "Fork's point" , "Point of a fork" .)