The most common and most likely answer to this crossword clue is the 6 letter word MALOTI
M
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L
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I
Buddy explains!

The straight part
We know that "African country greens" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case african country greens = maloti.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does MALOTI mean?
MALOTI noun- The basic monetary unit of the currency of the Kingdom of Lesotho, introduced in 1980 to replace the South African rand as legal tender.
- A coin or banknote betokening a value in (ma)loti.