Cad died before noon in Dutch port (9)
I believe the answer is:
rotterdam
'dutch port' is the definition.
(I've seen this before)
'cad died before noon' is the wordplay.
'cad' becomes 'rotter' (I've seen this before).
'died' becomes 'd' (abbreviation next to the year of someone's death).
'before noon' becomes 'AM' (as in AM on a clock).
'rotter'+'d'+'am'='ROTTERDAM'
'in' is the link.
(Other definitions for rotterdam that I've seen before include "Netherlands port" , "Dutch city and port" , "European port" , "foreign city" , "Major North Sea port - tarred tom (anag)" .)