12 across
Reality
show
tailing
female
(4)
Reality show tailing female (4)
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checks
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The definition is at the beginning of the clue.
How the clue works
See "Reality" there — that's your definition, something that's actually true. For the wordplay, take F (the short form for female) and stick ACT (a show) tailing along behind it, giving you F followed by ACT.