Artwork is attractive but lacking in force (7)
I believe the answer is:
etching
'artwork' is the definition.
(I've seen this before)
'attractive but lacking in force' is the wordplay.
'attractive' becomes 'fetching' ('fetching' can be similar in meaning to 'attractive').
'but lacking in' is a deletion indicator.
'force' becomes 'f' (symbol used in Physics e.g. f=ma).
'fetching' with 'f' removed is 'ETCHING'.
'is' is the link.
(Other definitions for etching that I've seen before include "Engraved picture" , "Deep print" , "Engraved artwork" , "Eating away; corroding" , "work of art" .)