Crossword Genius

Red colour finishing off drink (6,3)

Ross

I believe the answer is:

ginger tea

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

'red colour finishing off' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'drink' is the wordplay.
I cannot quite understand how this works, but
'drink' could be 'tea' (tea is a drink) and 'tea' is found within the answer.
The remaining letters 'ginger' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Independent.
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