Follow directions on identical oil producer (6)
I believe the answer is:
sesame
'oil producer' is the definition.
'follow directions on identical' is the wordplay.
'follow directions on' becomes 'se' (I am not sure about this - if you are sure you should believe this answer much more).
'identical' becomes 'same' (similar in meaning).
'se'+'same'='SESAME'
Can you help me to learn more?
(Other definitions for sesame that I've seen before include "Open . . . . . . cries the magician" , "Seeds used for making oil" , "Password of the Arabian Nights" , "Plant with oil-rich seeds" , "Seed used in flavouring" .)