Crossword Genius

Carl Zeiss regularly drinks (4)

Ross

I believe the answer is:

ales

'drinks' is the definition.
(ale is a kind of drink)

'carl zeiss regularly' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'carl'+'zeiss'='carlzeiss'
The alternating letters of 'carlzeiss' are 'ALES'.

(Other definitions for ales that I've seen before include "What might be delivered by pumps" , "Alcoholic drinks" , "Types of beer" , "A sale of beers" .)

I've seen this clue in The Telegraph.
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