Depart with singer Shaw for Californian port (3,5)
I believe the answer is:
san diego
'californian port' is the definition.
(I've seen this before)
'depart with singer shaw' is the wordplay.
'depart' becomes 'go' (synonyms).
'with' is a charade indicator (letters next to each other).
'singer shaw' becomes 'sandie' (I am not sure about this - if you are sure you should believe this answer much more).
'go' put after 'sandie' is 'SAN DIEGO'.
'for' is the link.
Can you help me to learn more?
(Other definitions for san diego that I've seen before include "City of S. California" , "Californian port" , "Calif. naval base" , "Southern California naval base" , "Agonised over the Californian city" .)