Crawler, extremely smarmy chap, not refined (9)
I believe the answer is:
sycophant
'crawler' is the definition.
('sycophant' can be a synonym of 'crawler')
'extremely smarmy chap not refined' is the wordplay.
'extremely' suggests removing the centre.
'refined' is an anagram indicator.
'smarmy' with its middle removed is 'sy'.
'chap'+'not'='chapnot'
'chapnot' anagrammed gives 'cophant'.
'sy'+'cophant'='SYCOPHANT'
(Other definitions for sycophant that I've seen before include "yes-man" , "Servile flatterer" , "Austen's Mr Collins?" , "old informer" , "Uriah Heep, say" .)