Seaside resort one favoured for special treatment (3,6)
I believe the answer is:
red carpet
'special treatment' is the definition.
(I've seen this before)
'seaside resort one favoured' is the wordplay.
'seaside resort' becomes 'redcar'.
'one favoured' becomes 'pet' (as in a pet project).
'redcar'+'pet'='RED CARPET'
'for' acts as a link.
(Other definitions for red carpet that I've seen before include "celebrity treatment" , "sort of treatment for special visitors?" , "What a distinguished visitor walks on" , "special welcome" , "for star treatment" .)