More curious to tour Italy -- it's louder (7)
I believe the answer is:
noisier
'louder' is the definition.
('noisy' is associated in meaning with 'loud')
'more curious to tour italy' is the wordplay.
'more curious' becomes 'nosier' ('nosy' can be similar in meaning to 'curious').
'to tour' indicates putting letters inside (to tour can mean to go around).
'italy' becomes 'i'.
'nosier' going around 'i' is 'NOISIER'.
'it's' acts as a link.
(Other definitions for noisier that I've seen before include "More of a racket" , "Perhaps more disturbing" , "Louder" , "More loud" , "More rowdy" .)