Crossword Genius

Doctor has old bovine sound (3)

Ross

I believe the answer is:

moo

'bovine sound' is the definition.
(I've seen this in another clue)

'doctor has old' is the wordplay.
'doctor' becomes 'mo' (medical officer).
'has' means one lot of letters go next to another.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'mo'+'o'='MOO'

(Other definitions for moo that I've seen before include "Bovine low" , "Guernsey noise?" , "Cow's sound" , "Irritating woman" , "Low (of cattle)" .)

I've seen this clue in The Mirror.
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