Crossword Genius

South America invested in oil campaign (7)

Ross

I believe the answer is:

crusade

'campaign' is the definition.
('crusade' can be a synonym of 'campaign')

'south america invested in oil' is the wordplay.
'south' becomes 's' ('S' can be a synonym of 'south').
'america' becomes 'a' (common abbreviation - e.g. in organisation names).
'invested in' indicates putting letters inside.
'oil' becomes 'crude' (crude is a kind of oil).
's'+'a'='sa'
'sa' inserted within 'crude' is 'CRUSADE'.

(Other definitions for crusade that I've seen before include "Action by Christians to recapture the Holy Land" , "Drive" , "Used car involved in campaign for a cause" , "Holy war" , "Medieval Christian military expedition to capture the Holy Land" .)

I've seen this clue in The Telegraph.
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.