Grotesque orcs are less refined (7)
I believe the answer is:
coarser
'less refined' is the definition.
(I've seen this before)
'grotesque orcs are' is the wordplay.
'grotesque' indicates anagramming the letters.
'orcs'+'are'='orcsare'
'orcsare' anagrammed gives 'COARSER'.
(Other definitions for coarser that I've seen before include "Comparatively crude" , "less refined" , "More vulgar" , "A scorer (anag.)" .)