Drink large serving (5)

I believe the answer is:

lager

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

'drink' is the definition.
(lager is a kind of drink)

'large serving' is the wordplay.
'large' can be anagrammed to 'LAGER'.
However, I am not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for lager that I've seen before include "Light-bodied beer" , "Regal kind of beer" , "Light beer needed" , "Continental beer" , "A regal sort of drink" .)

I've seen this clue in the Sydney Morning Herald.

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