17 down
They’ll
come
into
estate
carrying
50%
of
feed
for
livestock
(7)
They’ll come into estate carrying 50% of feed for livestock (7)
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The definition is at the end of the clue.
How the clue works
Look at livestock at the end — that's your definition, since heifers are young female cattle. You've got HEIRS (those who'll come into an estate) carrying FE (the first 50% of "feed") inside it, slotting the letters in to give HEI-FE-RS.