Makes picture of tourist, one cleaning graffiti perhaps (5,8)
I believe the answer is:
paint stripper
'one cleaning graffiti perhaps' is the definition.
'makes picture of tourist' is the wordplay.
'makes picture of' becomes 'paints'.
'tourist' becomes 'tripper' (tripper is a kind of tourist).
'paints'+'tripper'='PAINT-STRIPPER'
(Other definitions for paint stripper that I've seen before include "Remover of coats" , "What can remove gloss" , "Gloss remover" , "What removes coats" , "Decorator's preparatory fluid" .)