Croatia's leader concerned with depravity in Split? (7)
I believe the answer is:
crevice
'split?' is the definition.
(thesaurus)
'croatia's leader concerned with depravity' is the wordplay.
'leader' says to take the initial letters.
'concerned with' becomes 're'.
'depravity' becomes 'vice' (I've seen this before).
The initial letter of 'croatia' is 'c'.
'c'+'re'+'vice'='CREVICE'
'in' is the link.
(Other definitions for crevice that I've seen before include "Cleft, fissure" , "Split" , "Narrow crack" , "Opening" , "Narrow rock fissure" .)