Prevalent beverage? (3)

I believe the answer is:

ale

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

'beverage?' is the definition.
(ale is a kind of beverage)

'prevalent' is the wordplay.
'ALE' is hidden in amongst the letters.
However, I'm not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for ale that I've seen before include "Traditional beer" , "brewing?" , "Beer consumed in sales" , "Beer procured in sales" , "Alcohol" .)

I've seen this clue in the Evening Standard.

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