Crossword Genius

Staff I’m boosting, supplying one liqueur (6)

Ross

I believe the answer is:

midori

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

'liqueur' is the definition.
(I know that Midori is a type of fruit liqueur)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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