Crossword Genius

When astronomical body going down, doctor ready to act? (7)

Ross

I believe the answer is:

moonset

'when astronomical body going down' is the definition.

'doctor ready to act?' is the wordplay.
'doctor' becomes 'mo' (medical officer).
'ready' becomes 'on' (if a device is on it is ready for use).
'to act?' becomes 'set' (set is a kind of act**).
'mo'+'on'+'set'='MOONSET'

(Other definitions for moonset that I've seen before include "when night becomes even darker?" , "astronomical activity" , "Going down of Earth's satellite" , "disappearance of satellite" , "When satellite goes down" .)

I've seen this clue in The Guardian.
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