Crossword Genius

Host introducing a type of seed to coffee (9)

Ross

I believe the answer is:

macchiato

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

'seed to coffee' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'host introducing a type of' is the wordplay.
I cannot quite understand how this works, but
'a' is present in the answer.
'host' could be 'mc' (short for master of ceremonies) and 'mc' is located in the leftover letters.
'of' could be 'o' and 'o' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for macchiato that I've seen is " beverage".)

I've seen this clue in The Sunday Times.
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