10 across
Short
tenor
getting
refreshed
on
and
off
(5)
Short tenor getting refreshed on and off (5)
hints
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checks
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hints
The definition is at the beginning of the clue.
How the clue works
The definition is Short, meaning terse or curt. The answer is built from T (abbreviation for tenor) followed by ERSE, the alternate (even-positioned) letters of "refreshed" as signalled by "on and off."