17 across
Rehearsal
for
musical
that
has
prearranged
result?
(4,5)
Rehearsal for musical that has prearranged result? (4,5)
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The whole clue is the definition (& lit or double definition).
How the clue works
The whole clue is a cryptic definition of SHOW TRIAL, a trial whose outcome is fixed in advance. The wit lies in the fact that reversing the two words gives TRIAL SHOW — a "rehearsal" (trial) "for" a "musical" (show).