A drawing initially doesn't resemble anything at all (7)
I believe the answer is:
draught
'a drawing' is the definition.
('draught' can be a synonym of 'drawing')
'initially doesn't resemble anything at all' is the wordplay.
'initially' says to take the initial letters.
'anything at all' becomes 'aught' (anything).
The first letters of 'doesnt resemble' is 'dr'.
'dr'+'aught'='DRAUGHT'
(Other definitions for draught that I've seen before include "Unwelcome blow" , "Cool air current indoors" , "One short of cash feels this" , "Dragging or pulling - man on board!" , "netted fish" .)