More curious about one getting more rowdy (7)
I believe the answer is:
noisier
'more rowdy' is the definition.
(I've seen this before)
'more curious about one' is the wordplay.
'more curious' becomes 'nosier' ('nosy' can be similar in meaning to 'curious').
'about' means one lot of letters goes inside another.
'one' becomes 'i' (Roman numeral).
'nosier' going around 'i' is 'NOISIER'.
'getting' acts as a link.
(Other definitions for noisier that I've seen before include "More loud" , "Less quiet" , "Louder" , "More rowdy" , "more deafening!" .)