Nothing odd in gorilla painting (3)
I believe the answer is:
oil
'painting' is the definition.
(oil painting is a kind of painting)
'nothing odd in gorilla' is the wordplay.
'nothing' becomes 'O' (looks like zero - 0).
'odd in gorilla' becomes 'il' (I can't justify this - if you can you should give a lot more credence to this answer).
'o'+'il'='OIL'
Can you help me to learn more?
(Other definitions for oil that I've seen before include "Type of fuel" , "Greasy liquid" , "Slippery liquid" , "Fuel, lubricant" , "Valuable viscous liquid" .)