5 down
Smell
I
left
before
I
ate
is
cause
to
feel
bad
(9)
Smell I left before I ate is cause to feel bad (9)
hints
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checks
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hints
The definition is at the end of the clue.
How the clue works
Right, so cause to feel bad is your definition, that's the humiliate part sorted. For the wordplay, build it piece by piece: HUM is the smell, then I, then L for left, then another I, and finally ATE lifted straight from "I ate" in the clue — string those together, HUM-I-L-I-ATE, and there's your answer.