Card from company doctor (4)
I believe the answer is:
comb
'card' is the definition.
(thesaurus)
'company doctor' is the wordplay.
'company' becomes 'co' (abbreviation).
'doctor' becomes 'mb' (Bachelor of Medicine, Medicinae Baccalaureus).
'co'+'mb'='COMB'
'from' acts as a link.
(Other definitions for comb that I've seen before include "Crest on the head of some birds" , "Toothed instrument" , "Toothed grooming implement" , "For use on hair" , "Search methodically" .)