Welcoming North; unfortunately, South rude and noisy (10)
I believe the answer is:
thunderous
'noisy' is the definition.
(thesaurus)
'welcoming north unfortunately south rude' is the wordplay.
'welcoming' means one lot of letters goes inside another (I've seen this in other clues).
'north' becomes 'n' ('N' can be a synonym of 'north').
'unfortunately' indicates anagramming the letters.
'south'+'rude'='southrude'
'southrude' is an anagram of 'thuderous'.
'n' inserted within 'thuderous' is 'THUNDEROUS'.
'and' acts as a link.
(Other definitions for thunderous that I've seen before include "Loud and rumbling" , "Deafening" .)