Crossword Genius

Liqueur drained with a cutting parting shot (8)

Ross

I believe the answer is:

galliano

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

'liqueur drained' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'a cutting parting shot' is the wordplay.
I cannot quite understand how this works, but
'a' could be 'an' and 'an' is located in the answer.
The remaining letters 'gallio' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'with' acts as a link.

Can you help me to learn more?

I've seen this clue in The Telegraph.
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