Smooth second class country (5)
I believe the answer is:
bland
'smooth' is the definition.
(I know that smooth can be written as bland)
'second class country' is the wordplay.
'second class' becomes 'b'.
'country' becomes 'land' (synonyms).
'b'+'land'='BLAND'
(Other definitions for bland that I've seen before include "Insipid - uninteresting" , "Without flavour" , "without distinctive characteristics" , "Mild and insipid" , "Dull - tasteless" .)