Possibly Titian nude in sketch again (6)
I believe the answer is:
redraw
'sketch again' is the definition.
(I've seen this before)
'possibly titian nude' is the wordplay.
'possibly titian' becomes 'red' ('Titian' is a type of red hair).
'nude' becomes 'raw'.
'red'+'raw'='REDRAW'
'in' is the link.
(Other definitions for redraw that I've seen before include "Find a new winner" , "Change" , "Sketch again" , "Delineate again" , "Warder (anag)" .)