Artwork that's not initially attractive (7)
I believe the answer is:
etching
'artwork' is the definition.
(I've seen this before)
'not initially attractive' is the wordplay.
'not initially' means to remove the first letter.
'attractive' becomes 'fetching' (similar in meaning).
'fetching' with its first letter removed is 'ETCHING'.
'that's' acts as a link.
(Other definitions for etching that I've seen before include "Print produced from an engraved plate" , "Carving into a surface" , "Print produced from engraving" , "work of art" , "Deep print" .)