Regal drink (5)

I believe the answer is:

lager

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

'regal' is the wordplay.
'regal' anagrams to 'LAGER'.
However, I'm not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for lager that I've seen before include "Effervescent beer" , "Regal sort of beer" , "A brew" , "drink in the bar?" , "light ale" .)

I've seen this clue in The Irish Independent.

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