Spray can makes a Greek god look up (7)
I believe the answer is:
aerosol
'spray can' is the definition.
(synonyms)
'a greek god look up' is the wordplay.
'greek god' becomes 'eros' (Eros is an example).
'look' becomes 'lo' (archaic term meaning 'look!').
'up' says the letters should be written backwards (in down clue: letters go upwards).
'lo' in reverse letter order is 'ol'.
'a'+'eros'+'ol'='AEROSOL'
'makes' acts as a link.
(Other definitions for aerosol that I've seen before include "Spray creator" , "O so real (anag.)" , "Atomiser" , "Air spray" , "Pressurized container" .)