25 across
Interminable
rot
for
10
(5)
Interminable rot for 10 (5)
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The definition is at the end of the clue.
How the clue works
The definition is 10, which cross-references 10 across (FOOL) — Feste being the famous fool/jester in Shakespeare's *Twelfth Night*. The wordplay takes FESTER, meaning "rot", and removes its last letter as indicated by "interminable" (i.e. it doesn't reach its end), leaving FESTE.