Resort on front of Riviera is more pleasant (5)
I believe the answer is:
nicer
'more pleasant' is the definition.
('nice' is associated in meaning with 'pleasant')
'resort on front of riviera' is the wordplay.
'resort' becomes 'nice' (French coastal resort).
'on front of' suggests taking the first letters.
The first letter of 'riviera' is 'r'.
'nice'+'r'='NICER'
'is' is the link.
(Other definitions for nicer that I've seen before include "More pleasant or courteous" , "More pleasing" , "improved" , "more lovely" , "harder to please" .)