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Told
a
gentleman
to
conceal
senior
citizenship
(3,3)
Told a gentleman to conceal senior citizenship (3,3)
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The definition is at the end of the clue.
How the clue works
Look at senior citizenship — that's your definition. "Conceal" tips you off that the answer is lurking inside the phrase, and sure enough, told a gentleman has OLD AGE hiding right in the middle of it: t-OLD AGE-ntleman.