Suitable place to the south of a quiet river in Italy (8)
I believe the answer is:
apposite
'suitable' is the definition.
(thesaurus)
'place to the south of a quiet river in italy' is the wordplay.
'place' becomes 'site' ('site' can be a synonym of 'place'**).
'to the south of' is a charade indicator (letters next to each other).
'a quiet' becomes 'ap' (I've seen this in other clues).
'river in italy' becomes 'po'.
'ap'+'po'='appo'
'site' after 'appo' is 'APPOSITE'.
(Other definitions for apposite that I've seen before include "fitting" , "Of a remark, suitable for the occasion" , "Appropriate, pertinent" , "A pit pose could be to the purpose" , "Suited for the purpose" .)