Blended oil and wine producer finds mineral (7)
I believe the answer is:
olivine
'mineral' is the definition.
(type of mineral)
'blended oil and wine producer' is the wordplay.
'blended' indicates anagramming the letters.
'and' means one lot of letters go next to another.
'wine producer' becomes 'vine'.
'oil' is an anagram of 'oli'.
'oli'+'vine'='OLIVINE'
'finds' is the link.
(Other definitions for olivine that I've seen before include "Dark green mineral" , "Clear green gemstone" , "mineral in rock" , "stone" .)