Crossword Genius

Before noon, doctor's rounds (4)

Ross

I believe the answer is:

ammo

'rounds' is the definition.
(rounds of ammunition)

'before noon doctor's' is the wordplay.
'before noon' becomes 'AM' (as in AM on a clock).
'doctor' becomes 'mo' (medical officer).
'am'+'mo'='AMMO'

(Other definitions for ammo that I've seen before include "Bullets, etc. (colloq.)" , "Bullets, say, in short" , "that goes in magazine: ...?" , "What's fired from guns (abbr)" , "Bullets and bombs, etc (abbr)" .)

I've seen this clue in The Telegraph.
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