A Belfast fixer runs off for a drink (8)

I believe the answer is:

anisette

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

'for a drink' is the definition.
(anisette is a kind of drink)

'a belfast fixer runs off' is the wordplay.
I cannot really see how this works, but
'a' could be 'an' and 'an' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for anisette that I've seen before include "Aromatic cordial drink" , "drunk in Provence" , "Liqueur flavoured with seeds" , "Liqueur; tetanise (anag.)" , "[APERITIF]" .)

I've seen this clue in The Telegraph.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.