Oil supplier worked in Leeds (7)
I believe the answer is:
linseed
'oil supplier' is the definition.
'linseed' can be an answer for 'oil' (I've seen this before). I am not sure about the 'supplier' bit.
'worked in leeds' is the wordplay.
'worked' is an anagram indicator.
'in'+'leeds'='inleeds'
'inleeds' with letters rearranged gives 'LINSEED'.
Can you help me to learn more?
(Other definitions for linseed that I've seen before include "Source of plant oil" , "Oil produced from flax" , "Flax product, a source of oil" , "Flax plant product providing oil" , "Oil applied to cricket bats" .)