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10,
barely
sick,
housebound?
(6)
10, barely sick, housebound? (6)
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The definition is at the beginning of the clue.
How the clue works
The definition is 10, which is a cross-reference to 10 across (FOOL) — Yorick being the famous jester whose skull appears in Hamlet. The wordplay uses "barely sick" to extract the inner letters IC from s-IC-k, and "housebound" tells us these letters are contained within YORK (a royal house). So IC is placed inside YORK, giving YOR-IC-K.