Drink a goalkeeper might go for (8)

I believe the answer is:

highball

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

'drink' is the definition.
(highball is a drink)

I don't understand how the rest of the clue works.

(Other definitions for highball that I've seen before include "Iced alcoholic drink in tall glass" , "Whiskey and soda with ice" , "Beverage" , "American drink with spirits and soda in tall glass" , "speed?" .)

I've seen this clue in The Irish Independent.

Want a hint initially instead of a full solution? Install my app