Bird doctor goes round to object (5)
I believe the answer is:
demur
'to object' is the definition.
(to demur is to object to something)
'bird doctor goes round' is the wordplay.
'bird' becomes 'emu' (emu is a type of bird).
'doctor' becomes 'Dr' (abbreviation).
'goes round' indicates putting letters inside.
'emu' placed within 'dr' is 'DEMUR'.
(Other definitions for demur that I've seen before include "Raise objections" , "Waver" , "Protest or disagree mildly" , "Raise scruples" , "Raise mild objection" .)