Drink shark oil regularly (4)

I believe the answer is:

saki

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

'shark oil regularly' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'shark'+'oil'='sharkoil'
The alternate letters of 'sharkoil' are 'SAKI'.

(Other definitions for saki that I've seen before include "Japanese rice wine" , "refreshment for Orientals" , "Literary pseudonym of H. H. Munro" , "Short-story writer" , "Pen-name of Hector Hugh Munro, d. 1916" .)

I've seen this clue in The Telegraph.

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