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 definition is cheese. Taking the regularly-spaced (even) letters of often gives you F and E, and then tea as a spelling ("T-A") tacks on the last two letters to give you FETA.