19 across
Regularly
–
often
–
tea
is
cheese
(4)
Regularly – often – tea is cheese (4)
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The definition is at the end of the clue.
How the clue works
The word "Regularly" tells us to take alternate letters from "often tea" — picking the 2nd, 4th, 6th and 8th letters gives us F, E, T, A. The definition is cheese, and FETA is the Greek variety.