10 across
Leave
in
middle
of
stint,
being
cross
(5)
Leave in middle of stint, being cross (5)
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The definition is at the end of the clue.
How the clue works
The definition is cross — a tigon being a cross between a tiger and a lion. Take GO (leave) and drop it inside TIN (the middle of s-TIN-t), and you get T-I-GO-N.