As it happens, Oscar is in Greece reporting to a crude type that's always pressed (5,3)
I believe the answer is:
olive oil
'a crude type that's always pressed' is the definition.
I can't tell whether this definition defines the answer.
'as it happens oscar is in greece reporting' is the wordplay.
'as it happens' becomes 'live' (as in live television).
'oscar' becomes 'O' (phonetic alphabet: alpha, bravo, charlie etc.).
'is in' is an insertion indicator.
'greece reporting' becomes 'oil' (I am not sure about this - if you are sure you should believe this answer much more).
'live'+'o'='liveo'
'liveo' put within 'oil' is 'OLIVE-OIL'.
'to' is the link.
Can you help me to learn more?
(Other definitions for olive oil that I've seen before include "Liquid used in cookery or salad dressings" , "Pressed liquid used in cooking, medicine, soaps etc" , "Substance pressed from fruit" , "Pressed cooking ingredient" , "Light yellow dressing pressed from Mediterranean tree fruits" .)