Goes off wise guy over pressure put on Greece state (8)

I believe the answer is:

spoilage

I'm a little stuck... Click here to teach me more about this clue!

'goes off wise guy over pressure put on greece state' is the definition.
I can't tell whether this defines the answer.

'wise guy over pressure put on greece state' is the wordplay.
'wise guy' becomes 'sage' (I've seen this in another clue).
'over' means one lot of letters goes inside another.
'pressure' becomes 'p' (abbreviation).
'put on greece state' becomes 'oil' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'p'+'oil'='poil'
'sage' placed around 'poil' is 'SPOILAGE'.

Can you help me to learn more?

(Other definitions for spoilage that I've seen before include "Waste damaged material" , "Material wasted" .)

I've seen this clue in The Irish Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.