Balboa's greeting to Abraham in Californian park? (8)
I believe the answer is:
yosemite
'californian park?' is the definition.
(national park in California)
'balboa's greeting to abraham' is the wordplay.
'balboa's greeting' becomes 'yo' (greeting used by the film character Rocky Balboa).
'to abraham' becomes 'Semite' (the biblical Abraham is a Semite).
'yo'+'semite'='YOSEMITE'
'in' is the link.
(Other definitions for yosemite that I've seen before include "US National Park in California" , "Californian national park" , "California falls, valley, park" , "Natl. Park in California" , "Area of beauty" .)