Sea dog in battered coastal location (3,5)
I believe the answer is:
san diego
'coastal location' is the definition.
(city on Californian coast)
'sea dog in battered' is the wordplay.
'battered' indicates anagramming the letters.
'sea'+'dog'+'in'='seadogin'
'seadogin' with letters rearranged gives 'SAN DIEGO'.
(Other definitions for san diego that I've seen before include "City of S. California" , "Californian resort" , "Californian port" , "California naval port" , "Calif. naval base" .)