1 across
Disappearance
of
Ganymede,
say,
short
time
before
dawn
(7)
Disappearance of Ganymede, say, short time before dawn (7)
hints
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checks
0
hints
The definition is at the beginning of the clue.
How the clue works
The definition is Disappearance of Ganymede, say — Ganymede is a moon (the "say" flags it as an example), so its disappearance is a moonset. Build it from MO for a short time, then ONSET meaning dawn or beginning, giving MOONSET.