It's more pleasant in Venice, really (5)
I believe the answer is:
nicer
'it's more pleasant' is the definition.
('nice' is associated in meaning with 'pleasant')
'in venice really' is the wordplay.
'in' says the answer is hidden in the clue.
'NICER' can be found hidden inside 'venice really'.
(Other definitions for nicer that I've seen before include "More pleasant or agreeable" , "more accurate" , "Pleasanter" , "More pleasant or fine" , "comparatively agreeable" .)