Judge saw criminal giving talks (4)
I believe the answer is:
jaws
'talks' is the definition.
(jawing is a kind of talking)
'judge saw criminal' is the wordplay.
'judge' becomes 'j'.
'criminal' indicates an anagram.
'saw' anagrammed gives 'aws'.
'j'+'aws'='JAWS'
'giving' is the link.
(Other definitions for jaws that I've seen before include "Bond henchman" , "Gripping part of wrench" , "lectures" , "Film about sharks" , "Scary film" .)