Refined chap, slippery type (7)
I believe the answer is:
genteel
'refined' is the definition.
('genteel' can be similar in meaning to 'refined')
'chap slippery type' is the wordplay.
'chap' becomes 'gent' (I've seen this in other clues).
'slippery type' becomes 'eel' (I've seen this before).
'gent'+'eel'='GENTEEL'
(Other definitions for genteel that I've seen before include "Affectedly polite and refined" , "Affectedly refined or respectable" , "Artificially polite" , "Affectedly refined and upper-crust" , "Refined in taste and manners" .)