Company doctor to carry out a careful examination (4)
I believe the answer is:
comb
'carry out a careful examination' is the definition.
I can't tell whether this definition defines the answer.
'company doctor' is the wordplay.
'company' becomes 'co' (abbreviation).
'doctor' becomes 'mb' (Bachelor of Medicine, Medicinae Baccalaureus).
'co'+'mb'='COMB'
'to' is the link.
Can you help me to learn more?
(Other definitions for comb that I've seen before include "Systematically search" , "For use on hair" , "Honey structure" , "Fastening spikes" , "Toothed object for tidying hair" .)