Oil producer's area of operation? Hour away east (3,4)
I believe the answer is:
tea tree
'oil producer's' is the definition.
'tea tree' can be an answer for 'producer's' (I have seen 'antiseptic producer' mean 'tea tree' so perhaps 'producer' could also mean 'tea tree'). I'm unsure of the 'oil' bit.
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for tea tree that I've seen before include "Rosie's origin" , "plant down under" , "antiseptic producer" , "Australian shrub" , "source of antiseptic" .)